Silent with very high efficiency and able to power up any non-SLI system. Ideal for HTPC's due to silent operation, low temperatures and high efficiency. These are top quality PSU's and I would suggest that you have a good read at http://www.hardwaresecrets.com
where both have been extensively tested.
Only collection for these items as they are heavy unless you are happy to pay postage.
Enermax Pro82+ 425W
OCZ StealthXStream 400W