I've been very pleased with my 4670 card, but the new 4770 looks interesting too. Newegg already shows 4 of the 4770 cards. The all appear to be clones of each other using the same HSF, but it looks like it might be a quiet one. They look to be under a hundred after rebate. They are all dual DVI cards so far, with VGA, HDMI and Component dongles (except the HIS). The 4770 does use a power connection, so it may not be quite as thrifty with the watts as the 4670.
I may pick up the 4770 for my next card unless the next-gen nvidia stuff leapfrogs ATI for HTPC use. With the HDMI audio situation addressed, they should get much broader acceptance since nvidia seems to have an edge in 24p playback