* What is your budget for the 3 items??
* What case are you using?? This is a critical question, becasue some cases have the PSU in the bottom and can make things a bit tricky, if you don't know this ahead of time.
PSU thoughts:
My first thoughts are that you should go with at least a 650-750w PSU, a quality one. I like:
Antec, Corsair, Seasonic, & PCP&C PSU brands. They are reputable and have good track records and have good warranties, in the event you have any issues.
CPU thoughts:
I like the PhII x4 955 Black Edition, because of the value you get for it and it's performance is close the the 965 BE CPU, especially when OC'd. I'd get the 125w version. The origianl ones I believe were 140w versions, so there could still be some out there.
AMD PhII x4 955 link below:
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103808
HD thoughts:
I like the Western Digital HD's, because I have had several of them and haven't had any issues. Seagate HD's have had recent issues that I've read about, so I'm staying away from them for now. Samsung has been getting some good reviews, but I haven't done enough research on them to recommend them yet.
We can help you further define your parts, if you can give us a budget for the 3 items. The CPU and PSU parts can vary quite a bit, depending on your budget.