I have a whole bunch of those figures too, and none of them look that good. Some fantastic painting there. You have a very steady hand to get that kind of quality out of those old Grenadeir sculpts, and this is coming from a fan.
I like the older 25mm figures, but matching them up to anything available now is tough. On the other hand, when you paint up the miniatures and put them all on the same style of base the scale issues aren't as noticeable. I use the older Shadowrun and Cyberpunk figures for my Aliens/Colonial Marines games, as well as Judge Dredd.