CYMA's Echo 1's and other brands look at this link to get any idea what people are buying, this website is really good too, highly recommended:
http://www.airsoftgi.com/index.php?cPath=280
There are 3 category's I would look at the AEG one.
There is no such thing as a good AEG for under $50. if you want even close to reliability youd have to be ready to spend between $150-200
www.airsoft51.com best website for the deals you get
Dude, just so you know it will probably break in less than a month but airsoft megastore sells a m5 for 36 bucks
The most expensive.
The one that you shoot the best.
a cheap airsoft pistol. its a lot of fun
the only fmg9 available is the magpul fpg, which is over 100 dollars.
Well I have a couple of links I will include
No airsoft gun under $100 is going to last for more than a few games, so none are truly "good"
The best airsoft gun you could get for $150 would probably be an Aftermath gun, but you could get a JG M4 or M16 for under $150
MB03 by well
Try airrattle.com, airsoftgi.com, or just ebay!