like dev said its all on personal preference... but by the looks of things you would like an M4... G&G do dome good guns, i own one of the cheaper ones but it performs well... you can get better ones though, you my also want to consider an ICS cheap and chearful but easily upgradeable... or if you dont like the idea of taking the gun apart... buy two! lol, are you registered with UKARA also you may want to consider were your gonna play, CQB and you would want a short gun but woodland you would want a longer one... if you play a mixture you may want to consider something with a folding stock (G36 springs to mind...) and KWA do a nice G36...
Here is an extract of a guide i wrote...
if you are looking for more than just a gun check out the full guide here
http://freeairsofthelper.yolasite.com/reso...uide%5B1%5D.pdf
well thats the end of my comment that you probably yawned yourself through...
Thanks,
Mitchell