i think u should replace your SLK with a SLR McLaRen or 722 Edition one or u can try SL65 AMG or SL63 AMG but Sl-Class cars are a bit slower than SLR but faster, luxury than SLK. Personally, i don't really like Evo IX and Japanese Sport Cars i prefer 350Z and Skyline. if u can afford to buy another few exotics cars u can but a 599 GTB Fiorano in order to make your collection look "complete" as u own 2 Lambos already but only got 1 F-car. chevrolet corvette also not bad as it looks a little alike with F430 and is more cheaper and quick fast too.