Cant go wrong here no matter what model it is if its done less than 1000mls and been stored inside all that time !!!!
If its a 3dr your talking being worth somewhere between 15 - 20k,
If its a 500 am sure you could double that.
I would buy it and keep it as an investment as just think what something like this would be worth in 10 years time !!! A really good one these days is very hard to find and in 10 years time the values of them will have gone mental i can almost guarantee. % or so years ago a good MK2 RS 2000 or Mexico escort could have been had for 5k, you need around 8-10k now to find one in similar condition !!!
Keep us posted about this mate and get some pics !!!
Good luck.