Any of the RAM kits you've listed would be fine. They have equivalent specs. I have OCZ RAM in my system and it works great. I would have to say, lately, RAM is a commodity; all speeds being equal. Most companies are pumping out decent-quality RAM. Go for the lowest price in this case.
I like the Corsair power units. The general consensus is they are very reliable and high quality. I have a TX950 and I guess the best thing you can say about a power supply is it powers everything you need it to and you don't have to think about it. If the TX650 you're looking at is a V2, it also has a 80-plus bronze rating. Either way, though, I'd go with the Corsair.