Quite frankly, there is no other car for near its price which will be anywhere close to the 75 for entertainment and nearly as few which will match a 3 litre in outright performance.
Watch out for rust in the aforementioned places. Also, the sills, the front chassis legs where the wishbones attach to, the rear mounts for the watts linkage. Check the lower corners of the rear screen as well.
Cambelts need to be done every 36K, but also the hydraulic tensioner tends to leak and costs about £140 plus the belt change!
The later Motronic engined Cloverleafs go better than the earlier Jetronic controlled cars. However, they need that ridiculous catalytic converter removed for proper GTV6 type front pipes.
Watch out for a sloppy gearchange as the parts for the isostatic change are becomming increasingly difficult to obtain and are no longer produced (along with most items).
Electrics do give bother, but are usually okay with sympathetic maintainence and familiarity.
You could also opt for the Twinspark. It handles better and is cheaper to run, but oversteer cornering takes more commitment and is not available at will.
Its not all bad, they are generally quite reliable, but will need a fair bit of care. I wouldn't buy cheap though. You'd be better to buy an enthusiast owned, specialist maintained car. It will be more enjoyable and allow you to sleep at night.