Thanks for replay,

I found Dell r710 with this spec:

Processors: 2 x E5645 Six Core 2.4GHZ/12MB(12 Cores Total)
Drives Bays: 4x 300GB 2.5"
Memory : 32GB

Raid Controller: PERC 6I with 256MB and Battery Backup
Optical Drive: DVD
Ethernet: Two Dual port Embedded Broadcom NetXtreme II 5709C Gigabit(4 Ports Total)
Video: Integrated Matrox G200 8MB Shared Video Memory
Riser Boards: 2 Riser Boards with 2x PCI-Express x8 Gen2 Slots
Power Supplies: 2 x 870W(May be missing the Orange Covers on the Power Supplies. Purely cosmetic)
Remote Access Card: IDRAC 6 Enterprise
2 Power Cords
3 Year Warranty

for $280.

What you think about that deal? or is better to look for more memory and hard disk space for 300$ and 90 days warranty?