Having had a MK1 106 Rallye, 1000 UK models & MK2 900ish, I totally agree with Classics mag (top ten future classics) and say that it is an absolute future proof investment, unless you modify it then its worth less, keep the very light Michelin steel wheels, for get alloys they spoil the car, the interior and the all important air box and it will only go back up in value, it is the best small hatch about, the chassis dynamics leave small Fiats with a bloody nose. Gear changes are slick and quick the way it should be, clutch weighted well, great brake peddle feel.
The Mk1 has hand built unique engine, its a real gem, I racked up 30K in 2 years and replaced a track control arm in all that time, drove it from Bournemouth to Glasgow a 475mile trip loads of times (once without an oil cap as i forgot to put it back on, it lost 1/2L which was half way down dip stick as it was full before i left) , and sold it for more than I paid, I wish I could say that about my Cinq.
Anyone who says they are rattly are missing the point, especially of Rallye models of a French hot hatch, light, fast, and well balanced on the limit, I would gladly sacrifice a few rattles for 150kgs of soundproofing any day of the week.
My mate back in Glasgow sold his VTS about a year back to first person who came to see it after 2 years of ownership, it was 3 years old when he got it and it needed zero done to it in his time and 40K apart from servicing, he replaced with a Focus ST170 which can't say the same.
I've been looking at 106GTi's as a replacement as my everyday runner (would love a Clio Williams but couldn't live with running it everyday, should be cherished as its special) to replace the Cinq turbo and its top of my list, especially a late model with leather.