First of all, Fileplanet and Mod-Db are not the best places for stalker mods, the vast majority of stalker mods are located at
http://stalker.filefront.com/, so that's the obvious place to start
Anyway, it seems what you want is something very clouse to the vanilla game, just with a bit more stuff and some minor tweaks, this is correct?
Well if so, you should probably avoid the bigger mods, the bigger and more ambitious the mod, the less compattible it becomes with other mini-mods (or the mini-mods must be tailored to fit the bigger mod), so lest one of the big mods is allmost exactly what you are looking for, you are probably better off mixing and matching some mini-mods you like, and there's no shortage of thouse (just remember that if two mini-mods are trying to use the same files, they are allmost certainly going to conflict with eachother, but other than that, they should be able to coexist nicely).
For starters i can recommend you look at the "Arsenal" and "Float 32" mods, that'll give you a whole lot more guns and better graphics, and then start shopping around for whatever else you might want, if you didn't like some aspect of Stalker, chances are you are not alone, and someone has made a mini-mod that changes it, so there's no shortage of stuff out there, AI-mods, Trader-mods, Weather-mods, Anomali-mods, Graphical-tweaks, HUD-mods, Mission-tweaks, you just gotta look for it.