ATIs all use good tv out chips (all built by ATI that is)
"powered by ATI" might have any chips on them. Sapphires make all ATI brand cards and so they usually (always?) have the same chips, but others you should be warry of.
Geforces come / go. Some are great (as good as ATI) and others suck big <add animal here> <add male anatomy parts here>
So anyway... go with ATIs are a safe bet. But if you like geforces... look around and you will find some great cards..
Malox's I remember having good TV out... I don't know if they still are.