You have a BTX motherboard. Nobody really makes any worthwhile BTX motherboards as upgrades. For a replacement, I wouldn't know if it works because I know nothing about your current motherboard aside from the size. Don't know the model, the brand, etc.
What exactly are you trying to do, and why?
Core 2 Duo E6600 @ 3.33GHz w/ Silverstone Nitrogon NT06 (both lapped)
ATI Radeon HD 4850 @ 690/1150
ASUS P5K-E WiFi/AP Edition, 4GB DDR2-800
Lian Li PC-7B w/ 2 Silverstone FM-121 + 1 FM-81
LSI MegaRAID 320-2 w/ 18GB 15k, 74GB 15k, 2x150GB 10k RAID 1 (SCSI drives), 500GB SATA
Creative X-Fi Platinum
Enermax Aurora, Logitech MX1000
Envision EN2028 20" 1600x1200 + Samsung 710N 17"
Yamaha HTR-5940, 5x PolkAudio Monitor 40 bi-wired with 12AWG, PolkAudio CS1, Klipsch Sub10, Optical from X-Fi