3 would start a flamestorm with the "unrealistic" mag size, and a +100 to the price would be nearly meaningless. Agreed wrt recoil though, and I think it should take up something like 8-10 blocks - there is absolutely no way in hell a full-sized battle rifle should take up less weight and bulk than a much shorter, collapsible AK.
I don't see the point of 7. Not only is it no better than any other weapon of similar price if you can't make reliable headshots, the bow takes up so much bulk that it seriously limits your options so even if you weren't earning scads of money you'd really have to know what you're doing anyway.
As for 1... it's been too long since I couldn't afford the medgun from the very start for me to comment, but I'd rather see a variant with no healing dart which could go for a reasonable price and would count as a commando weapon.