Since best is an opinion, I don't know if I can answer your question correctly. In my opinion, the best, most powerful airsoft gun is the M134 by Echo1 airsoft. I shoots 400+ FPS, has 100 rounds per second, and is the biggest freakin monster you'll ever see. Check it out on their homepage-
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Sysyema airsoft guns are the best, they are made using high quality reinforced steel. They run anywhere from 400 to 1500 dollars.
the second best is the m16 or m4a1 from airsplat the cheapes and best airsoftguns around the max on them babies is 500 plus fps and 200 -250 range but they are in the 1000 price range the ones i have are m16- 400 fps and 190-200 range priced at 169.99 and the m4a1 was 159.99 420 fps and 180-190 fps
Nerf gun
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
The one you can afford
If you are just starting airsoft i would highly recommend an aeg, (airsoft electric gun) but if you are pro and experienced, a trained camouflaged sniper is the best, an invisible predator. However it does depend on the user of the gun. If you are asking performance wise then g&g makes the best airsoft guns on the market. (currently in the US)
I say twin ozez are the best cheap airsoft guns
dont get that gun walmart has the best beginer guns
it depends on what cheap is to you
Definitely Nerf.
www.shortyusa.com
The best way - go to near airsoft workshop, give them money and tell what do you want. If you decide to modify airsoft gun by yourself - be warned, this may ruin your gun and even be dangerous to your health.
"Systema" is by far the best airsoft gun brand out there.
An Airsoft gun