For $200, I'd say your best options are (for new guns at least, you can sometimes find good deals on used guns)
G&G plastica MP5 or a full metal CYMA MP5.
CYMAs
http://www.airsoftgi.com/product_info.p ... ts_id=4460http://www.airsoftgi.com/product_info.p ... ts_id=4461http://www.airsoftgi.com/product_info.p ... ts_id=4462http://www.airsoftgi.com/product_info.p ... ts_id=4872http://www.airsoftgi.com/product_info.p ... ts_id=6051I would avoid the blow back models. A lot of them are out of stock, probably because of all the gun raids in China. Other places might have them in stock.
G&G MP5
http://www.airsoftpost.com/product_info ... s_id=28441http://www.airsoftpost.com/product_info ... s_id=31813For some reason, G&G seems to have switched their MP5 Plastica to an MP5 "combat machine" and added blow back. The first one doesn't mention if it is a blow back model, but it most likely is. I'm not sure how easily the blow back is disabled since G&G doesn't use a "mechanical" blow back, but rather it's powered by air. (If you disable it, it might mess up compression and what not if you don't change the cylinder)
Haven't used either, but I've "heard" (key word) good things about both of them. CYMA seems to make some pretty reliable guns and G&G is always a great brand. My friend's CYMA AKM performed very well for a stock gun. One thing to keep in mind with the CYMA MP5s is that they shoot around 400 fps (IIRC). You would need to downgrade to play CQB. (M100)
The G&G M4 blowbacks are supposedly coming with hotter springs now, so I would assume their MP5s do as well. IIRC, the blow back combat machines are shooting in the 350-380s. (newer ones at least) You might try to find some reviews on these guns, that will definitely help your decision.
If you can afford to spend around $260, you could get a Proline G&G MP5. (you still need to buy a battery and charger and if you don't have them, that's another $60 minimum. So quite a bit outside your budget lol)