Mid-range new build, first timer

Hey Folks, thanks in advance. I'm building a system from scratch for the first time, thought I should put the components through the forum gauntlet before I pull the trigger. If you can see and glaring incompatibilities or you have general suggestions, please let me know :-)

Case: XION Solaris XON-403 Black with Green LED Light Steel ATX Mid Tower Computer Case - Retail

GPU: SAPPHIRE 100258-1GHDMI Radeon HD 4850 1GB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Retail

PSU: CORSAIR CMPSU-750TX 750W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Compatible with Core i7 Power ... - Retail

Memory: OCZ Reaper HPC 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory Model OCZ2RPR10664GK - Retail

MOBO: GIGABYTE GA-EP45-UD3P LGA 775 Intel P45 ATX Intel Motherboard - Retail

Bluetooth: AZiO BTD603-132 USB 2.0 Bluetooth Adapter (Class 1 v. 2.0) - Retail

CPU: Intel Core 2 Duo E7400 Wolfdale 2.8GHz LGA 775 65W Dual-Core Processor Model BX80571E7400 - Retail

OS: Microsoft Windows Vista Home Premium SP1 64-bit for System Builders w/ Tech Guarantee - OEM

HDD: Western Digital Caviar Black WD1001FALS 1TB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drives - OEM

Altogether comes to $830 on Newegg. If all the rebates go through it'll go down to $760. Also supposedly has a free upgrade coupon for Win7.

Other thoughts: I already have an external DVDR-Rom that I'm going to use until BD prices come down. Also I already have a spare wireless card. Keyboard and mouse taken care of. Planning to use a new HDTV as the main monitor... thoughts? In the future I want to add more GPUs in Crossfire and HDDs, hence the monstrous PSU. Let me know what you think.

Using the system mainly for gaming and amateur video/photo editing. My tech level is average, have never built a system myself, but I'm looking to learn. Thanks :-)