New pc need help

ok so i have this to start with:

i7 2600k
gtx 580
16gig ram
z68 mobo
intel 520 ssd

this machine runs everything i do now on 15 accounts, but i would like to run 15 on 3 for less lag
so 5 on 1 x3

i want it to be better than what i have now but not expensive. i did a build on newegg with new 8core amd 16gig ram 120ssd gtx670 and so on but hte price was 1600 to my door.

2200 is my max spend limit

i want 3 lg 23in moniters aswell. and a usb kvm of some kind.

any ideas i have 4 days before i order.