Beginner help selecting graphics card

I am purchasing a dell windows media center desktop that I am going to hook up to my 36" sony tv with a media extender via wired ethernet. Then from the extender I am going to use s video to my tv and optical audio to my stereo reciever. My question is I have a choice of three video cards : Intel® Graphics Media Accelerator 950 , or 128MB PCI Express™ x16 (DVI/VGA/TV-out) ATI Radeon X300 SE HyperMemory for $50 more, or 256MB PCI Express™ x16 (DVI/VGA/TV-out) ATI Radeon X600 SE HyperMemory for $90 more.

I do not do any gaming, I just want to be able to use normal applications, but want to have a good tv signal to my sony tv. Does the card play a big roll in what I transfer to the tv or is it only for things that run from the monitor at the cpu?

Any help would be greatly appreciated.

Thanks,

Jeff

well the radeon hypermemory uses system ram as well but i think it uses less of it. i would still go for it on the offchance that a game may appear out of nowhere and have to be played
i haven't a clue as to what difference the card would play in this scenario but i would imagine it would support a faster refresh rate or something of the like