|Budget can mean a lot of different things to a lot of different people :)|
What is your budget for these items? MAY not be able to use the PSU depending on which route you take as newer CPU's require the extra power molex (6 or 8 pin can't remember off top of head). Can you supply the actual PSU model?
I'm assuming you want to use the same case, what kind of board does it support? ATX? mATX? Do you have the case model?
Also, what type of hard drive, CD/DVD drive do you have? Not all motherboards come with IDE now-a-days. Do you have an special add-in cards or anything of that nature?
The more info, the better. Thanks!