If you ever see the Nissan R89C come up then you should get it. Similar in performance terms to the Minolta but it makes for a slightly more relaxing driving experience thanks to it's 5 speed box. It will lap in similar times to the Minolta, around the Highspeed Ring and Daytona Road course it's a few tenths quicker. It also sounds quite good, Bob loves it and it's relatively cheap (for this type of car) at 3.5million.
Even although you now have the 2J, I would recommend the 2D wholeheartedly. I got one the other day and used it for the Nurburgring 4 hours where it was a joy to behold. It's about 12.4million which isn't cheap but it's worth it. The older Chapparal handles brilliantly and will lap faster than the Jaguar xj13, Ford GT40, Ford MKIV and Ferrari 330 P4. It's also very easy on tyres (I was getting 3 laps from Racing hards, competitors only got 2 laps). I also noticed that the tyres wear quite evenly on all 4 corners which means the handling doesn't go all haywire.