I would recommend an MSI-6378X-L for the mobo. It's only $61+free shipping, and I'm sure you've got some SDR laying around to pair it with. It has onboard video, sound, DEC Tulip-compatible ethernet built in, and 3x PCI slots if you need them for some reason.
http://www.newegg.com/app/ViewProduc...scription=6378
I also like this case:
http://www.newegg.com/app/ViewProduc...er=Description
Too bad it's out of stock until next week...
Oh, and did I mention that this thing is absolutely stable? And an Award BIOS, with (a few) tweaking features?