The less you pay, the less you get out of the gun.
This is really emphasized in airsoft.
If you cheap out and spend 200 - 300 on some clone piece of shit, the price will reflect on its quality.
Stuff like VFC is going to run you around 600 - 700+, and its well worth the money.
Its easier to get a gun that will work and last out of the box rather than starting cheap and 'upgrading', its not worth the headache.