I just read your thread about selling the Z4 to renovate the kitchen and bathroom (good move IMHO), and was going to suggest the Clio V6. I had one a while back (MK2 255) and loved it. Easy to live with and a very individual and special piece of kit.
MK1 examples can be had for well under £10k and in some ways they are the nicer car – the original, smaller, more iconic. Most of the mechanical parts are from the Renault parts bin so inexpensive to buy. Some of the engine work can be a pain as the access is so tight. Things like a cambelt (you won't be used to those on the BMW!) are hard to get to so expensive but I think there are a couple of specialists doing them for about £600 and they are only every 5 years. Just check it has been done or is not due. Clutches can be expensive too for the same reason (part is only just over £100!), there have been some cases of gearboxes failing (mine was one and it was off the road 13 weeks waiting for a replacement to come from Dieppe!) although I think it is quite rare in general. Engine is the 3.0 V6 found in an Espace so it is quite unstressed and reliable in a little plastic car.
They are surprisingly practical despite having next to no boot (area in the front bonnet like a 911 but it is small). The engine bay is where I used to carry most things but just don't put your frozen or chilled groceries on there! They are not actually all that fast, I think I had 157 out of mine but it took some doing and acceleration wise it was not far off something like a BMW 330 in the real world. But it was rewarding. There are a lot of people with ordinary shopping Clios like the 182 etc who think their cars are just as fast but it is far from the case – a lot of crashed Clio V6s (actually, be careful when buying!) at the launch led to what I think was much hype about the handling being deadly when it is actually incredibly good – massive amounts of grip. The problem is when you push them too far which is something that is quite hard to do on a public road, there is little warning that the back is going to bite you and when it does it does not matter how good a driver you are as your fate will be partly down to luck!
Used mine as a daily driver, did track days in it, went to the Alps in it. Loved it. Often found myself talking to people about it who were just interested in what it was.