I like the Mk1 Mexico's but that wouldn't be where I'd spend my money.
If this is in the rules, I'd split it on :-
a) A tatty but thrashable 911 3.2 Carrera (drove a friends 1984 example, which had 300,000 miles on the clock, and loved it to bits - they are similar to Morgans in a lot of ways)
b) a first generation Lotus Elise with a Honda vtec conversion and a supercharger
c) If I had any money left over (or can I up the budget a bit - please ?) I'd add a 1973 Rover P5B Coupe.
OK, I am now bankrupt, but it was fun !
Matthew