About to buy a torque converter which would work the best?

71 Duster
340 30 over
x heads
XE268H cam
Torker 340 intake
eddy 750 performer carb
727 auto
8-1/4 with 3.91 gears

I was looking at the Mopar 175K piece which stalls at approximatly 2500 rpm for $200

but I've also found

11" from Dynamic converters stalls at approximatly 2600-3200 rpm for $259
11" from Coan stalls 2600-3200 for $289

which one would be a good choice or should I look somewhere else. I'd like to keep in the about the same price as the ones I listed.