The Radeon would be a good choice for DVD playback, I have seen one for £155 for the 64MB DDR VIVO module in a local shop (West Sussex).
I didn't go for it though because at the resolutions I play games at, my MX gives better frame rates plus there was a lot of talk about below average driver support.
Other than the driver problem (which will probably get better), i'm sure it's a good card.
Corm