Thank you all for your feedback and advice. I'm looking at the 25cc Stihl (FS90?) and it is clearly a nice machine. I need to weigh out whether it's worth the extra money (the largest cost difference is that I cannot use the attachments that I already own...the Husky, Toro and Tory-Built allow me to keep these attachments).
Also, to a previous point, 12 years is a pretty good life and maybe that's good enough given the cost difference. I think I'll give the Husky a test drive and see if this machine is going to work for me. If not, I'm going for the Stilhl or Echo.
Thanks again - it's always helpful to have a broad base of opinions from experienced and informed people!