( Note: My k-1 knowledge isnt the best)
I think Arlovski would do quite well in K-1 and as someone mentioned earlier, Paul Taylor, I think he could do pretty good.
In answer to Anderson vs Manhoef I think Manhoef would be a challenge for Silva in the stand up, he is a compact, powerful guy with a hard shot. But I think a good fight in MMA OR K-1 would be Wanderlei vs Manhoef, both are exciting fighters with aggressve styles and KO power
"OK I'm sorry... Bang! Bang! Bang! No I'm not!"- Bas Rutten
"I think you should be able to kick in the head, itís a fun thing to do."- Wanderlei Silva