Is there something wrong with your current converter? IMO you should not fix what isn't broken.
There isn't a lot inside a basic torque converter to break (since by nature it slips). The only parts to break are the ones that DON'T slip i.e. the torque converter clutch. And if it does start slipping, it isn't going to leave you dead in the water.
I'd suggest increasing the trans line pressure above stock to give better clutch hold, and make sure that you downshift out of OD for hills.
Oh, and if you don't already have a BIG trans cooler in front of the radiator, install one. Heat is your transmission's enemy.