Hi Chris,
I own a 254XP, good fast saw but it was getting tired as well. I recently purchased a Husqvarna 365 special. It is a big powerful saw thats tailored to lopping up big hardwood. The only drawback is that it is heavy. I got it here in NB for $700 taxes in.
I've also used a 270 Stihl that my brother owns. It is a nice light , fast saw and good priced here in the Maritimes. The only drawback to it was it runs poorly in the snow without a winter kit. Stihl also offers a 290 but it's not as rugged as the 270.
Good luck in your purchase!
Rob
Ariens 11528 snowthrower, Craftsman 18hp lawn tractor, Craftsman 5hp lawn mower, Craftsman 4.25hp pressure washer, Stihl BG55 leaf blower and vac, Stihl SH26 string trimmer, Husqvarna 365 special Chainsaw, Husqvarna 254XP chainsaw.