2004R with 410 gears is the BOMB!! Plenty of zip off the line and great cruising ability. Some trimming of the upper cross member (no tunnel work) is required otherwise it's pretty straight forward.
You'd be the third to recommend the 200R4. In fact, the poster above you said you had a write-up. Is there any advantage to the 200R4 over the 700R4 or 4L60/4L80?