SNB stands for Sandy Bridge.. the latest processor series launched by intel. They are more powerful than any existing processors from AMD as well as Intel's previous gen Core i7 like Core i7 950.
The two most well known of them are Core i7 2500 and core i7 2600.
And if gaming is the purpose of the system then 22" monitor like BenQ G2220HD having 1920X1080 resolution is not a good option. HD 5750 cannot play all the current games smoothly in full HD resolution.. it is better for 1600X1200 resolution.
So my opinion is to opt for a 20" display.
My suggestion will be
Phenom II X61075T 3 GHz@ 9K
ECS 885GM A2 Motherboard @ 4.2K (Full ATX, 4 Ram slots (Upto 32 GB), 2 PCI Express X16 @ X16-X4, 2 PCI X1, 2 PCI)
DELL IN2020M @ 6.5k
Seagate 1TB - 2.7k
LG DVD Writer - 0.9k
APC 800VA - 3.5k
total 26.8K.
Total 24.3K