Hmmm a quality gym-type treadmill will set you back 5k dollars over here in the UK. I would definitely suggest getting one that has a guarantee for the motor.
Also important is the size of the running area, for safety reasons. Is it as wide as a conventinoal gym treadmill? Are there rails and an emergency stop button just inc ase you fall over?
Note that if you have the motor cranked up to max it won't last long, so get one that will go significantly faster than you are planning to run at.
Cushioning is a factor, unless you have expensive running shoes lol.
In looking at gym equipment, I decided I could afford a LOT of subs to commercial gyms for the price of a decent treadmill - you could even join a "cardiobunny" gym JUST to treadmill if your weights gym lacks good cardio equipment or enough of it - this would still cost less than a really nice treadmill.
Anyway, don't expect anything decent that is actually NEW with a motor for less than a grand.
just my 2c - I decided to just keep up my gym subs, as I couldn't afford anything nice.
And unless you have one of those big-ass basements you americans all seem to have that we are all way jealous of over ehre, get one that can fold away....