Thanks brothers about lots of information.
In fact, I really don's want to overclock. And I decide to use the 2600 one. So is cpu i7 2600 ok?
By the way, I just got my CPU case as follow. what do you think about it? Thank you:
Intel CPU Core i7-2600
G.SKILL DDR3 16GB (4 x 4GB) PC-10666/1333 F3-10666CL9Q-16GBXL Ram
Gigabyte GA-H67MA-USB3B3 Intel Mainboard (B3 Stepping) - LGA 1155 4x DDR3, 6x Sata, Gigabit Lan
Western Digital Caviar Blue 1TB 7200RPM 32MB SATA3/2
(or Western Digital Caviar GREEN 1TB IntelliPower 64MB Sata 6Gbs")
Kingston 64GB SSDNow V100 Series, SATA II, TRIM, 2.5"
OCZ Solid State Drive Bracket 2, 2.5 inch to 3.5 inch SSD bracket
VGA: Gigabyte nVidia Geforce GTX550 Ti OC 1GB DDR5, DVI x2, HDMI - Overclocked Edition
# Core Clock 970 MHz # Memory Clock 4200MHz"
CoolerMaster Hyper 212+ EVO CPU Cooler Socket: AM2, AM3, 775, 1155, 1156, 1366
3 x Antec TrueQuiet 120mm Case Fan with 2-Speed Switch
1 x Antec TrueQuiet 140mm Case Fan with 2-Speed Switch
Case: Antec One Hundred (SSD 2.5" + support Motherboards: Mini-ITX, microATX, Standard ATX)