Well I can tell you right now that you will be overclocking like a mad man if you get a Gigabyte GA-965P-DS3:
^ I wish I could ship internationally, because mine's for sale and I could save you a good chunk of cash, but shipping internationally will make the whole deal not worth it, may as well go buy one at the store.
That is the board I used when I got my E6600 to 3.5Ghz, and it's also the board Idiotec (another member here) used to get his E6400 up to 3.7Ghz! It is an awesome board, I just had to replace it because it didn't work right with Linux.
I think you'll be okay with your 7800GTX, I'm okay with my 7900GT for probably another year and a half. :classic:
As for the cooler, haven't used or seen or heard of it, maybe someone else can answer that question.