What kind of aqarium should I get my turtle?

I have a male red eared slider turtle and he is (last time I check) is about 6 1/2 inches long(not including head or tail). Anyway I need to get him a new tank because he is too big for the one he has so I need to know what kind of tank to get him and where I can get one. I would also like to be able to get him a sort of basking area so if anyone knows how to make one or if there are things I can buy please let me know.