I went from a gen 7 to a gt4. I loved it at first, and put up with the cost but its seriously annoying me now. I average 19 mpg and with it being 20 years old this year, the body work on mine really is starting to show its age with paint flaking on the front bumper and spoiler and I had to have the roof resprayed as that was just terrible. You could find a very very good well looked after GT4, but an old car with high miles is just that, even if loads of components have been replaced, something else will eventually fail.
My GF has recently bought a 190 gen 7 and I can honestly say now that im use to the GT4 speed, the gen 7 although slower is just as fun as you can use most of the power most of the time while still getting decent mpg. I will be going back to a gen 7 in the very near future. The GT4 is a great car and if I had the money to throw at it, I would make mine perfect and use it as a daily driver no problem. But its all down to cost and if your willing to faff around with it