It's a real difficult one. The fords just went mad. Those Capris were lovely. I sold a few Fords, (mk1 Mex. Mk1 RS1600 - yes I know, and a really lovely mk3 RS1600) of which all I really loved, great drives every one of them and all so great looking, but who would have seen what was coming.
Back in about 1982 a guy offered me an E-type for £3500 and a Renault a110 for £1000!
I will not let the Supra go, as I love it and believe it will massively appreciate but they will never be like the Fords IMO. It's an image thing, due to European racing/rallying which the supra just does not have. However, if you have the room and love it, and it is a great car to drive, no mistake, I'd say keep it as it will appreciate, considerably (thank you F&F) and is just a great drivers car and will always be such an icon for those in the know, just look at the USA market.