Chainsaws: I own a 12yr old Husky Practica 61. I abuse the poor thing, I start once or twice a year, I never drain the fuel or put in stabilizer, but is always starts one the second or third pull. Today, it didn't start. /w3tcompact/icons/shocked.gif The fuel line turned into a rubbery goo, and separated from the carb. A trip to ACE and a whopping 29 cents out of pocket, I was up and running with only three pulls. /w3tcompact/icons/grin.gif It does leak bar oil, but only if I don't store it on it's side. If I were to buy a small saw for trimming, I would definitely look at the Husky 335XPT. It is a small lightweight pro-quality saw for tree climbers. It is probably expensive for it's size, but it's not an entry level saw.
Recipricating saw: Have you considered a recipricating saw for trim work? I have 24Volt Bosch recipricating saw which I use for triming. It handles limbs up to 4" with no problem. I've tackled much larger with it, but I wouldn't recommend anything larger than the blade length for safety sake.