Its actually my first time building a computer as well. I've done some research but I'm still not totally sure if the hardware I've picked out will work and I still haven't decided on a network card, sound card, and memory. Can someone give me some help or some recommendations?

Power Supply - Kingwin LZ-750
Motherboard - Gigabyte GA-EP45-UD3P
Processor - Intel Xeon X3370 LGA775 3.0GHz
Heatsink Fan - Thermaltake Blue Orb II CL-P0257
Hard Drive - Samsung 1TB 32 MB Cache 7200 rpm
Video Card - MSI nVidia GeForce 9800GT

Sound Card - ?
Network Card - ?
Memory - ?

I'd like to run Snow Leopard 10.6.2 and Windows 7 via the Parallels software. Is that possible with the components I've selected?

I have a lot of learning to do. I'm just about ready to purchase all the parts and need to know if they'll all be compatible and what else I'll need. I appreciate any input I can get.