Hey you dolmar guys, whats the difference between these two, the 5000 is a dolly 5105 I think, 50cc and 3.9hp, the 5600 is 56cc with same hp. I guesse the real question is which one would you go with, running 3/8 chain and 20" bar. The price is 75$ more for 5105..I know there's quite a few guys runnin 5105s, any one had any experience with the 5600?