SLK 350 or SLK 55?

Moin friends, will sell my CLK W209 at the end of the year and then get me a SLK. As it looks like, it will be a 350, and the 55s will also appeal to me, primarily because of the V8. Did any of you have any experience with the two vehicles? For me, this looks like there is no big difference anymore. 305 vs. 360 hp, and the AMG weighs 100 kg more. 4.9 and 5.4 from 0-100, is also not so big a difference. If it should become the SLK 350 e, would he definitely get the AMG styling package and AMG-18″, as well as Bi-Xenon, sports suspension/lower, 7G automatic, comand, sound system, leather and seat heating. Any tips & suggestions, what else should absolutely be pure? Or what is superfluous? Best regards Brito