I'm familiar with building desktop pc's but I haven't read a lot about media centers. I see a fair amount of people throwing dual cores and such into them and that just seems excessive to me. What parts can I kinda skimp on and what are the absolute must haves in a home theater pc? I have an xbox with XBMC on it doing the job right now but I'd rather start looking into a HTPC because I plan on getting a projector in the upcoming months. What components do you guys have in your HTPC's or which parts would you put in yours considering a reasonable budget?