If you're looking for something inexpensive, but solid, I'd recommend this Lite-On 300W server PS from Directron.
LINK
This baby was made for Compaq servers, and weighs about 5 pounds! It's also got 2 VERY long leads (27"), which are greaat for big cases. The heatsinks inside are huge...
I've been using one of these with my 8RDA+, and it's been very stable running SETI 24/7. The +5V readings usually run 4.98, with the lowest I've even seen since starting it up was 4.92V.
If you check out the specs, this is a good deal!