Stihl and Husqvarna are the two main quality chainsaws used by professionals + lower powered makes can be purchased from garden centers but in either case I would recommend training before using, I remember the course I was on, we were told "there are no minor accidents with chainsaws". Sorry I'm not trying to put you off but there's (P P C) personal protective clothing to consider also
If it's only small diameter logs, something like a 32" bow saw (Sandvik is best) and a saw horse is good enough, keeps you fit too!