OK here's a technical solution to needing more horsepower to do MPEG4 decoding with VIA. First they have a super small form factor EPIA N coming in April. This will be a super small system, but with an updated memory interface.
They are also doing a mini-ITX version too using a board called the EPIA SP. This is tuned not just for MPEG2, but also MPEG4 and it supports faster memory running at DDR400 rather than DDR266 plus a 1.33GHz processor.
Both are something to wait for. Hexus has a review of the upcoming Tranquil "T2":http://www.hexus.net/content/reviews/review.php?dXJsX3Jldmlld19JRD05OTM= based on the new board as well as the the older MII based system running windows media center 2005 called the "T2.e":http://www.hexus.net/content/reviews/review.php?dXJsX3Jldmlld19JRD05ODM=.
The Tranquil by the way like the Hush is fanless.