TNAG, I think you need to make your mind up as to what you actually want from the machine. It sounds to me like you'd be fine with a workstation that has network attached storage.
Yeah, I don't think I really know what I want it to do myself. I like the idea of having a wireless drive, but I would like it to do more, but I don't know what that more actually is, I was kind of looking for ideas at the same time, which isn't a good way to go about a purchase.
Thanks for the advice anyway, everyone. If I am going to make a decision I have enough info to do so, I'm just going to step back for a bit. I think I got a bit over excited at the idea and ran away with it.