What gun to get?

i dont know what gun to get.
current guns:
sg552
deagle
usp
colt
m700(duh)

i wanna get a new gun my thoughts are:
mp5
tar21
spas 12
xm1014
rpk

i already know how to control the recoil/bullet spred on my sg.i dont wanna get another pistol.shotguns seem really fun but the xm1014-a is the only one that seems to pwn.so...