I've considered the PS3 but haven't researched it a great deal. It doesn't seem like PlayTV has made it to the U.S.A. and even if it has I'm not so sure I want to risk getting locked into a Sony proprietary system.
I looked at the SN78SH7 but it doesn't support AM3 processors and I really wanted to get a Phenom II. Also I would much prefer to get a system with NVIDIA 9300 onboard graphics. Only problem seems to be that there aren't any motherboards out there that support AM3 processors and NVIDIA 9300. Maybe I should just wait to see what Shuttle comes out with later in the year since they're the only ones who seem able/willing to support AMD and NVIDIA on the same motherboard.