Well, knowing my +12V rail is rated @ 5A on the OPUS 150, the max watt CPU I can use is 60w. Unfortunatley, all the intel dual cores seem to be 65w+, so I had to re-think the issue.
I ended up with a AMD Athlon II X3 400e which is a 45w CPU.
Its a AM3 board so I had to get a bigger board than I wanted, an mATX over mini-itx.
MSI GF615M-P33 mATX
I also got a 2Gb stick of DDR3-1333.
I'll have to use some converter cables for the 20 to 24V and the P4 connector, but It should be good.. we'll see
Thanks for the suggestions!