These are the official recommended power requirements based on your graphics card:
450 Watt or greater power supply with 75 Watt 6-pin PCI Express® power connector recommended (550 Watt and two 6-pin connectors for ATI CrossFireX™ technology in dual mode)
This applies to the whole system not just your card.
Both brands have a very good reputation for consistently producing high quality PSUs. However as you can see from the above requirements, the 520W unit would be more than enough for your needs so that would be by recommendation.
Thanks. I am inclined towards the Antec simply for the higher Wattage for possible future requirements. I was hoping someone had direct experience with either of thesePSU.On the other hand I may never need the 650W
Not direct experience but you can more or less guarantee that they will be of high build quality from those two manufacturers. If you're worried you may require more than 520W or just want the scope for the future then go for the 650W. However, even if you do add that extra HDD and Blu-Ray Drive I wouldn't say you'd need more than 520W.