If you have a groomer as a friend ask her opinion of what brand to get if you need to purchase any. Groomers are tough on their clippers only because they get a lot of daily use not abuse...but much on & off of the motor, heat up and cool down and change blades frequently...all things to consider.
Also ask about single versus 2-speed and turbo powered clippers.
Many brands offer these as options....if you are going to spend $$, do it right the first time and not need to replace them again for quite some time.
I have and am very happy with the Oster line.
I have A5 clippers in single, double and turbo speeds...I seem to collect them like others collect figurines.
I also have a single speed and variable speed large animal clipper also by Oster/Sunbeam.
I have never had any problems with mine and have had them for many many years...true workhorses.
There are many "newer" companies and products on the market now...search them out and again ask a recommendation from your friend and trainer.
I hear good and bad about all brands so do take that into consideration.