K member broken, suggestions?

Okay I have searched the forums and read a lot on the k member posts that I have found and it has honestly friend my brain a little bit. I am going to replace the k member currently in the car, which you can see a picture of below, and don't know what the best one for drag/street use should be.

I am leaning towards a v8 k member(have a swap meet I am going to tomorrow in hopes of finding one) since some of the nicer units are out of my price range, minus the QA1 but a lot of people seem to think it is not so great. The car will primarily be taken to a cruise night and the drag strip. If anyone needs to know for a decision on k member it will be getting a 440.

Thanks for advice, opinions, points in the right direction, or anything!