SL 500/600

Hello, I am currently thinking about buying a R 129 500 and I have noticed that 600 he is only slightly more expensive or even cheaper and that with mostly better equipment. But probably the cost of the 600s kills me, I’m not talking about consumption now, I just drive 5x fuelling in the year anyway. I imagine a year 96-2000 as full equipment as possible (incl. hardtop) what else should cost me? or what else do I have to pay attention to except the usual. Or stay i I’d rather go to my W 124 convertible?