I have seen fully functional Diamond branded video cards from the 90's, so they hang on there. Whether current ones are more reliable than any other... well, you can start by reading reviews. Check the warranty, longer warranty would mean that manufacturer has more faith in their product than one with shorter warranty.
On the other hand, there are a lot of AMD processors (AMD owns ATI) that have Radeon 6000 or 7000 already integrated into the processor. So, depending on your build, you may not need a discreet video card.
6 TV's in the house on FiOS and we only pay $4.99/month to connect them all!!! Power to the CableCard and WMC7!!!