you could just go with a SPR.
a sniper AEG doesnt have much use, since any Joe with any gun that shoots field limits can send BBs as far as you can.
Building a counter sniper isnt as fun as it sounds, since there arnt that many snipers, and most people just run assault anyways.
sniping in airsoft is overratted IMHO. Even the snipers will tell you to start as a regular guy and try sniping later.