SL 350 or SL 500 Help

Hello everyone! I’m new here and I hope for your help, I’ve already read a lot here and find your knowledge really great. So my problem is this, I want to buy a new vehicle a SL350 or SL500 so from year 2002. What would you recommend to me I know that the 350 he has no ABC chassis as standard and consumes about 3 liters less. if I add a 500 I’m afraid that the ABC suspension could cause problems and the repair of this system is not particularly cheap. Since I can only drive in the city the consumption is important to me, sometimes quite honestly what consume your SL`s in the city, highway is not important. thank you very much in advance!!!