Anyone know a good mATX case?

[mmcookies]

Seems a bit pricey on some things...

Not sure where you are located but check for deals, if there's a Fry's nearby they often have some really good prices, pretty good deal on a core 2 duo + mainboard right now for example (although I dislike ECS boards).
http://www.frys-electronics-ads.com/

Also do you really need 320gb HDD for these boxes? seems excessive if all you're using them for is WoW.

I'm actually not too overly concerned about pricing. I buy from the regional distributors in Vancouver and that means I get pretty much the lowest prices in Western Canada.

I'm more concerned about performance/adequacy, and reuseability. I'm far more likely to cannibalize these for other projects than resell them somewhere down the line.

[mmcookies]

How about, boot Windows off a DVD, and then mount a networked drive ?

I've thought about it, but I want to be able to play quickly and reliably. Network drives can be quite temperamental at times, and I don't want to have to deal with sporadic problems.

At $30 an hour, I think I can easily end up spending 10 hours or more fixing network drive issues, which I feel justifies the cost.