Id recommend M60 for HM high ammo high lethality but low accuracy.
Id recommend K-2 for normal battles, queit for GM 30/90 ammo high power low recoil and higher accuracy.
Would recommend m4a1
I would recommend QBZ-95 a great weapon.
XM8 if not the M4 or AK.
K-2, QBZ-95, EVERY gun is the best if you know how to use it. Yea, even UZI
AK47.............
I would recommend any weapon within budget. They're fairly balanced, unless you're comparing a high-power AR to say, the MP7 in damage. But overall, I'd recommend the K-2 as a starter weapon if not the M4A1 or AK47, as those are obvious choices.