if you absolutely must stay at or below your budget of $150, then that card i linked to is your best option. however, as crystal method pointed out - you could just buy a tv-tuner add-on card, and keep whatever existing video card you have.
overclocker, i'm not quite sure what you mean by the 9000 being crippled and then talking about the 7500? at any rate, the 9000 is fairly comparable to an 8500, and has ATI's superb image quality.
my opinion, take it or leave it, would be that if your current graphics card is of the 9000 level of performance or above, to just buy an add-on card, as crystal method suggested. however if you're also looking to upgrade your video card to be able to play TODAY's games alittle better, then the 9000 AIW would be the best bet.