As TomSeller mentioned earlier, having a good dealer close is an important factor to consider. I have Stihl, Poulan, McCullock, & Jonsered saws. The Jonsered CS2139T is professional 39cc top handle saw which is heavily used. I love it. (Actually most of the saws I use are top handle, I like the ergonomics better than a rear handle.) There are great saws in many brands. If you are looking at only one saw & would use it fairly often, I would recommend a 50-60cc farm/rancher or professional grade saw. Stihl 362, Jonsered 2162, Husqvarna 455, 460 562xp, Dolmar PS6100. If you are looking at a 35-40cc range: Stihl 201, 192, Jonsered CA 2139T, Husqvarna 435, 338xp, Dolmar PS 351.
Dependability & good service from a close dealer - Prime factors in choosing a saw.