They are both excellent choices. I've always had a very strong attraction for the AMX because my dad was a GM for an AMC dealer in ATL when they came out in '68 and he always drove one. Red with the white strip down the center and the 390 and 4 speed. They were so fast and handed great, for the time period anyway. I remember meeting Mark Donahue back then when he was racing the Javelins and then the Matador for NASCAR. I must have been about 11 or 12 then and I remember going to the Atl Speedway to watch the race from one of the sky boxes that AM corporate rented for the local dealers and corp big wigs. I remember Mark Donahue coming up to the sky box after the race and if I remember right he finished 16th.
I remember riding in one with my dad while doing four wheel drifts around some of those on ramps around Atlanta. He use to race stock cars in the 50's, before me, so he knew how to push one very hard and be in control.
Did you know that Alabama use to use Mark Donahue edition javelins for hwy patrol cars?

I think, as others have already agreed, that the Crossfire has a lot of the AMX body lines. If AMC was still around today, the Crossfire could just as easily been the newest AMX.

If I had the extra money and space, I'd find the newest SSP roadster SRT that I could and then try to preserve it with as few miles as possible. This combo seems to be the rarest of all the SRT-6's.

That's just my thoughts.