Best Close Quarters Weapon?

Im going to buy a weapon for close quarters.

Ive been thinking about three weapons which is either:

-MP5
-Dual Desperadoes
-XM1014

Is it possible you could recommend a GP weapon for me. Im not limited by GP.

I'll also consider other weapons if they are good enough.

I have the AK47, M4A1, Desert eagle and the AWM already.

Thanks