FPS doesn't mean anything when it comes to range and accuracy, so don't even consider the FPS of the rifle.
A brand new tokyo marui VSR-10 at 300fps will have the same range and better accuracy than some chinese 480fps rifles.
If you want a REALLY realiable stock platform that's accurate, easily upgradeable with high quality parts, and compatible with upgrade parts, get a marui VSR-10 or marui L96
But if this is your first gun, don't get a sniper rifle. Get an AEG.