I may have a 5 door grey ST-3 [leather] coming in p/ex at the weekend, 40k miles, 56 plate and will be around £8k. This is not a for sale advert as I don't have the car yet. However, I'm available via PM.
Good cars ime, we've been through a few of them over the last few years and not had any warranty issues [touch wood]. The last one had an exhaust/chip and was fairly rapid too!
As for 3/5 door. If the kid can climb in the back on their own, I'd say 3 door as they haven't got window switches/door handles to fuck about with. If they're babes in arms, a 5 door would be easier on your back surely?