1. I've seen a few posts recommending the 460w HU460EBS-00 PSU via Dell, but am unable to find this part on the official site. They list a 460w PSU (Dell part CPX-0FFD6) is that the same thing (I also see a 500w Dell part CPX-5K7J8)? And if not, is Ebay the only solution for acquiring the 460w HU460EBS-00 PSU?

2. Are there any better/safer upgrades than the above, or has anyone had success with a particular product?