For me I doubt the s2 will ever hit the heights of the s1,3dr or escos as there's just too many of them about plus they never really made a "special" version of it to make it super rare etc.
I certainly wouldn't keep it for that reason alone,as a car I love them but not an investment,that gav123t had a minty mint one and I remember it being on sale here for about 4 months constantly getting the price dropped yet everyone saying how stunning it was.
An s1 in that condition and price?
Doubt it would be there a week.
I look back and think of all the decent cars I sold and broke quite often kicking myself that I didn't keep them but I needed the cash at the time and that was that.
There's always seems to be another one coming up for sale that you think "I wish I could get that and put it away" but in all honesty it's hard to have something like that either
A) sitting in the garage on a sunny day
B) basically £2-3000 sitting there and you need it
C) the cars condition just deteriorating etc.

Get rid,enjoy the cash,enjoy your frs and come back to a project in the future when you've got spare time and cash to sort it.