Radeon SDR is the faster card in 3D (not by much thanks to the slow memory). However, Radeon VE is dual head capable, which you'll find nice when using the TV-out. Besides, the once very slow 3D performance of the VE part has been improved quite a lot with later drivers that un-cripple it to use all its hardware. (Older drivers artificially made it even slower than it had to.)