New computer

[RC35]

Hey guys
I purchase a computer a couple weeks ago and im gonna put the specs below but to be honest im not to happy with it,im getting good frame rates on fsx but i was expecting a little better performance.
I try to get 3 monitors going and the frame rates dropped from high 20's to like 7.
I need some advice in witch one shou i get,im gonna put the specs below.

this is the one i have
IBUYPOWER
IntelCore i5-3570k at 3.4 GHZ
12 GB MEMORY,1 TB SATA Hard drive
2x HD 7750 1 gb crossfire Graphics


and this is 2 of them im thinking about getting so witch one you guys think its better

CyberPowerPC Gamer Aqua Windows 8
IntelCore i7-3770k
16GB Ram 60 GB SSD 2TB HDD
Liquid-cooled and overclockaded
Blue ray player and AMD Radeon HD7850 graphics with up to 2GB VIDEO MEMORY.

Or this one

CyberPower PC gamer Supreme SLC4400
Windows 8 AMD FX-8150 16 GB RAM 120GB SSD 2 TB HDD
Liquid cooled AMD FX-8150 ZAMBEZI EIGHT-CORE PROCESSOR
NVIDIA GeFORCE GTX660 TI GRAPHICS 2GB Video Memory