If you want fun, forget about diesel "hot hatches" for starters. I've had a Fabia vRS and while it was a decent car, it wasn't that much actual fun.
Clio 182s - very overrated. I had one. Pretty quick and decent handling but not really as good as most say - the Primera GT I have now outhandles it with ease (yes, really).
Civic Type-R - decent car but no steering feel.
Why a pseudo sports car and not a proper one?
£5K will get you a VERY nice supercharged or turbocharged Mk1 MX5. £5K will get you a PROPERLY mint example of an MR2 Turbo. These are both FANTASTIC cars which are MUCH more fun than some of what is mentioned in this thread. They won't depreciate much either.
An Integra Type-R is a good shout. I've had one of those, and it was a properly good car, and very quick indeed. A hell of a lot better than a Clio thats for sure.
If you want a hot hatch save yourself a few quid and go for a 306 Rallye instead. Buy a good one and it wont depreciate and it is just as fast as the Clio and handles a lot better.
How about a Ford Racing Puma? Those things are a riot to drive. People who say "but they're only 150 bhp" are missing the point completely. Watch people in 200 bhp cars that try and keep up on corners spin off into the trees! Again, virtually depreciation proof.
£5K would get you a very nice M3 E36 too. If you want reliability go for the 3.0 instead of the 3.2. Not much slower and less to go wrong. I had a 328 Sport, was a good car, but to be honest, I still reckon any of the above would be more fun than an M3, even if the M3 would demolish them in a straight line.
Edit: Just read your post again, and it looks like I've pretty much ignored all your requirements! Never mind