I would say get a separate microphone and headphone. If your microphone is only to allow people to understand what you are saying in a relatively quiet environment (no need for noise cancellation) then even 5 dollar microphones should suffice. Pay a bit more for a proper shielded one with some nice cancellation and that leaves you with a bigger array of choice and quality for your actual sound with your headphones.
With headphones the next question is what sort of sound do you want and what is your environment. Is it for gaming? or listening to music? As with gaming you might care more for being able to hear all details or high impact, than things sounding balanced or non fatiguing. However if you are looking in the 200 euro price-range I assume you want a proper set of cans. (If you want bass boost still then as much as I hate the overpriced pieces of crap, the beats probably have the best bass boost implementation out there as they use a bass tilt which gradually increases the bass over the entire spectrum, instead of a regular filter which often got a sharp cut off point).
Do you have a street nearby or people talking, and do you want to block out sound, go for a closed headphone.
If you are in a quiet environment and nobody is going to get bothered by sounds coming out of your headphones. Then go for open headphone designs, as its simply easier to make them sound more controlled.
If you are trying to get a headphone for longer time use go for over the ear headphones. Anything that touches your ear can end up feeling painful over longer durations or can make your ears sweaty in longer sessions.
Want to plug your headphones directly into a computers audio port, or do you want to use an amplifier to amplify the audio. If you use a computers audio port, you probably want to get a relatively low resistance headphone of maximally something like 128 Ohm resistance. As otherwise the output of your port might get issues powering the lower end making it sound a bit shrill.
With your price range, If it was me buying I would probably look for a Sennheiser HD595, its easier to drive than say more traditional senns as the 580 600 650 etc. So it works well without a dedicated amp. But in general the sennheiser 595 is the most comfortable headphone I've ever owned. More comfortable than the 650 and 600 which do need an amp to drive it. And more comfortable for my ears than the Beyer 770 or 990 series. (I personally use a set of STAX headphones atm which are horrid for ergonomics
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But tbh when purchasing a headphone for a lot of money, best is to go to a store (go to a specialized store, but don't believe in the mumbo jumbo of special cables sales persons try to sell you with) and try some out. Just make sure you don't buy overpriced equipment with bas boosts etc in it. If you want adjustments do it yourself through software.
Check for things like how well you can separate instruments. If you listen to the bass does it start and stop instantly and can you actually listen to the tone of it, or is it more like boom boom. Does low to high flow over well, or do you feel like you hear a separate high, mid and low on the headphones. Does it sound like instruments are playing in your head or are they playing a bit more outside it.
If you hear a lot of "detail" make sure that what you are hearing is not sharp and metally when something goes up to the higher notes.
Have perhaps a bit of vocal heavy music, and if you play an acoustic instrument some music of the instrument you play. As then its often quite easier to discern if it actually sounds like how that instrument should sound.
When trying things out always watch out for headphones that immediately give you the feeling that there is a lot of "power" or "detail" as that can mean that it simply got a v-dip which will tire you out after listening for longer durations. Sometimes the headphones that sound more boring end up sounding better.
But the most important thing to think about when buying a headphone, is to remember that even very expensive headphones beside some luxury features, generally all have extremely low production costs (you often pay a lot for research and tuning with more expensive brands). Anyway because of this remember that a headphone that is 1/4th the price of another can still sound better, and even within a single brand some of the cheaper headphones in the range can be true gems, while more expensive ones can be utter crap. So if you decide to buy something without trying make sure you read some basic reviews (usually in cheaper ranges reviews are more honest than in the expensive ranges, but still beware as a lot of reviews earn their money from advertising for the brands they review). In my experience past 100 euros you quickly get diminishing returns with getting more expensive headphones, personally I often spend more but that often goes together with them being good at the exact thing you want them to be good at.
