You can get a GTR circa £30,000 - £33,000 but 2009 with a high mileage.
Theres one on autotrader for £28,000 but with near 110,000 miles. Roasted....
Maintenance on those will be several grand a year.
25k was going to say Z4 M which I would consider and save the rest of the money. Cayman 3.4 older, Lotus, TVR but how reliable are they?
My colleague had the v8 Aston. Said nice car great sound visiting the dealer servicing enough said.
GTR servicing costs, tires, brakes plus extended warranty at Litchfields. Id say have a spare £3k -£5k handy at all times lol. The older the worse it gets.