Stihl 028AV ( needs repairs), vs. new Stihl purchase

Hi Folks. I have an older 028 AV chainsaw with electronic ignition. It needs a rebuild due to gas getting into the muffler when I try starting it. I was told that means it is a cylinder/piston/ring issue??..I would like to know if anyone here has purchased an aftermarket cylinder/piston kit, and if so, which is a better brand. Also, I am weighing the issue as to whether I should just buy a new Stihl chainsaw....what is comparable to the old 028? I have been using a MS210C and it does not have the power that I need. Any advice is welcome:) Thanks.