hell yea get heavy duty ones! as far as which ones you can use the search button to see what u joints guys here are running, theres bound to be quite a variety, i personally run the napa heavy duty u joints, but they dont have grease fittings, supposed to be stronger without them. bad part is i cant ever grease em.
I reccomend you do it yourself no matter what brand you get. If you own a vise and a set of sockets, you are good to go, just search and you should find what you need and if you are stuck...after searching (for real, and not just saying it) you will get the help you need.