Ok i can see your point for wanting a smaller case because you're into LAN. Forget what I said, micro-ATX will be ok. You can still build a pretty sweet gaming computer even with that. Just not as good as a full ATX mobo but that is just the trade off for portability.
For a processor, you might as well go dual-core. It's not efficiently used ATM but future games are going to be heavily based around dual core. When buying a computer, future prospects are always good to look at.
Graphics card: since you won't have SLI due to the micro ATX, go with something powerful like a 7800GT/GTX, X1900/XT/XTX, or 7900GT/GTX. Hopefully you ordered a mobo with PCI-e interface.
Harddrive configuration: go with a Western Digital Raptor 10000rpm and a larger SATAII hdd for regular storage.
Monitor, i say go with a fast response LCD. A lot lighter than a large CRT (good because will be packing it around with you).
I'm not sure how that is doing for your budget because I would have to check price totals but you might want to do that. im just throwing out recommendations.
ok yeah that should be all right