Whilst on the subject of parts, whatever your choice, it's worth noting that regardless of the notion that the motor is maintenance free, the rest of the machine is not, so shit will wear out, so don't simply assume that two or three years down the track you'll be able to buy things like say replacement blades for example.
Your large box stores are great at pushing product, but will often offer little to nothing in terms of back up service and or support, so it's worth checking that you can get parts or repairs conveniently around your location, and there's a decent chance of that still being the case in the future.
A good example of this is the GMC product range that Bunnings used to flog for some time, they ( bunnings ) represented around 90 odd percent of that companies business, and when for whatever reason they decided to no longer stock that product, as you'd imagine, losing 90% of your business in one hit is gonna hurt, and they went out of business, so once you needed something to keep it going, you were out of luck and it becomes landfill.