Do you plan on getting competetive with racing? Or just looking for a track toy?
Either way you want something parts are cheap and plentiful for, that's moderately reliable and that's easy to work on, which go against all 4 you've mentioned
If you plan on getting competetive, steer clear of cars with torsion bar rear beams
(because the mk1 clio really struggled when competing:dapproveI've heard they can be a nightmare to match with higher spring rates, which is very important when building race cars. Your best bet would be a redtop corsa
(because they handle lovley):rasp:a civic/integra vtec, mazda x3/mx5/mx6, bmw 325/328
If you don't want to compete, then a mk1 1.8 16v clio, 106 gti, saxo vts, 306 gti, 205 gti would be great.
(every single car you have mentioned here handles like a dream and would be the perfect track or competing weapon)
A chap I know has a 306 gti trackday car, bolt ons like decat and catback, induction kit, and a set of racing slicks. The 306 gti has a baffled sump as standard, so oil starvation isnt an issue when using slicks. It's a quick yoke around a tight track.