Being a tree surgeon myself the thing I would suggest is:
How much are you going to use it if you are going to use it a lot I would look to buy a second hand Stihl/husqvarna
What diameter stuff are you going to be cutting in the future can you put a bigger bar on it if needed can the engine coop with it
Are servicing bits easily accessible by supplier (chains bars anti vibration mounts air filters etc)
I would set about trying to get a reputable make saw with easy access to spares but it's just my opinion plus it holds a better resale value if you decide to sell it on at a later date
