V8, but which car?

Hello people, I am looking for competent advice for my vehicle search. I have been driving a BMW e39 530iA Limo for 7 years, and am still very satisfied with this reliable car. I have to make inspection and service, and also buy only good brand tyres. I pay TK at approx. 35% 800€ in the year and 200€ tax. the fuel consumption is 8.5 to 13 liters in average. I drive approx. 6000-7000km in the year, 70% overland 10% BAB and 20% city. now I have much about various V8 read through and found that a V8 would only be slightly more, or even the same, if not less would cost in maintenance, and the sprite consumption would have to be as much as I need for my 3.0L row-sewer. for the following cars : Ford Mustang GT 4.6 V8 S197 305PS ( 05-09 ) Mercedes CLK 500 ( 300 or fl 388 hp ) ( 03-09 ) BMW e60 Limo 540,54550 BMW e63 coupe 645,650 these are the cars that would come into my narrow selection criterion. e car data, fl, vfl, ect pp and the engines informed. driven of it I am the Mustang GT and found him very horny, bit on the chassis, and a SL 500, from sounding great but you notice him the 2T empty weight already. now I want to ask which car you would decide for, and why ? and if you have experienced with one of the vehicles, would also interest me the maintenance as the weak points. I want to spend up to 1500€ and bit about 150,000km I don’t care if 4.0 ,4,4 or 5.0 ,5 liters of space ,300ps are enough for me too. so I would be grateful for any advice