DDR2 rams are not so cheap tho sometimes old tech worths more than new Btw give some specific info about your parts and if i am not wrong i think you can use Tom's Hardware > Forum > Deals section for selling stuff here.
what did you want to know specifically?
Just use it as a HTPC.
I don't really understand the whole home theater PC thing. What exactly does this mean?
I don't have a TV, cable, or satellite. So what else is there, music? Yes I have a huge music collection but why would I need a separate computer for that.
Any other reason to make it an HTPC?
Would it be good for running gameservers or webhosting or anything like that?
Like your rams is it single module ? and what brand? mhz? 800? 1066?