Buying a Chainsaw

It has come to that time in my life where I need to buy a chainsaw. I have a few gardens to tidy up and have a variety of bits to cut ie trees and branches. I've done the standard google search for reviews etc and I'm set on a petrol chainsaw but am a bit unsure/confused for which brand to go for. Any recommendations? I've also come across a Black & Decker Cordless one as well, anyone have that? Cheers!