Things to look at when getting a torque converter will be the cam and rear gear your running.

I think the hype about the Continental converters is well earned. I spent $700 last year on a "10 Continental converter and couldn't be more happy with it. It feel almost stock putzing around town until you punch it and ti shoots right to 3 grand.

I ran the "13 Continental before that and it didn't have a high enough stall speed for my liking.

Continental is a very efficient converter.

However the cores are drying up or have dried up. Not sure you can get either of them now.