What's your hardware and what's your budget? That should be the first question.
I'll give you what I use, which runs a highly overclocked intel Q6600 (3.6GHz daily speed), 8800GT, 2GB of ram, 2 drives etc:
Newegg.com - SILVERSTONE SST-ST56F 560W ATX 12V 2.01 & EPS 12V Power Supply 100 - 240 V FCC, CE - Power Supplies
It's using over 400 watts under load per my kill-a-watt meter, but runs flawless
The OCZ stealth line I think is one of the newer (lighter weight) PSUs. As such, I wouldn't use it for a power hungry machine, if you have one. You say heavy duty, so I would recommend what I know works great. Mine can run with 4 instances of folding@home running 24/7, plus whatever else I may want to do. The silverstone zeus is built like a brick, it's solid.