Ouch, that explains the price.
If you're going for a single card, then I'd go with a Corsair TX750 or TX650 power supply, I think newegg has the TX750 for around $90 which is a hell of a deal. I've got two of these and have had zero problems, and i bought them back when they were $130/ea.http://www.newegg.com/Product/Product.aspx?Item=N82E16817139021
In regards to the RAM, you'll never miss it. In all actuality you could probably do 4GB and never notice, but given RAM prices 8GB is a good future proof number for now.