Brushcutters are similar to chainsaws in that unless you're cutting really big wood, the key is in a sharp cutting implement, a big cc cutting head is not needed.
I'd say pick a pro quality cutter with a 30CC or bigger head and run a real brush cutting blade and you'll be gtg. Just remember a brush cutting blade is like a chainsaw blade, run it into the dirt and you better sharpen it or you'll just be making noise and smoke vs. cutting.
