tbh none of them except the V6 are ever going to be proper 'collectable' and/or worth a huge amount in the future. Lets be honest, 205 T16's, Renault 5 Gordini etc are proper collectable hatches - they differ greatly from the standard Renault 5/Pug 205 and were build for homologation purposes...
So I would say the only one worth a shout is the V6 purely because it is different hugely to the other models - RWD, V6 etc etc.. the others are just suspension tweaks and a bit of lightening etc etc. The williams maybe, only because they are from a generation of hot hatches proper and I feel have a sentimental edge..
I'd like to think the cup, trophy etc may have some collectability but I just can't see it.
I love both and would love to have both in my garage to keep- but I think it would be more for sentiment than value in the future..
my two pennies worth anyway