G&G CM (Combat Machines) make good introduction guns, not bad to start off with if you just want to test out the waters.
None of those three, however, are really an ideal platform to build from if you decide to get heavily into airsoft. It will be difficult to recoup any money you put into a gun that isn't full metal. For that reason I would recommend the CM16 Raider, because It's considerably less expensive.
If later you decide you want to get into airsoft, you can use the money you saved to put towards a nice full metal VFC of LCT.
Last edited by Kozzie; April 20th, 2015 at 20:49..