I figured if I am going to cut the torsion bar support, I might as well go 6 speed. I know it's more expensive than a TKX. I'm not sure how much of a savings there would be with a TKX. By the way, I have a 4 speed now.
I've been running a spreadsheet of major parts based on the list goldduster318 posted in his thread using current pricing. That is running about $6600 including tax and shipping as best I can guess. I ran the numbers with a TKX and the cast Lakewood bell and no juice clutch and got it down to $4200. That's enough that I have to answer the question (for myself) if the added gear and better splits is enough to make it worth it. And with the (IMO) potential for a smaller tunnel...it's hard to say.