Hi!
I ran a similar question back in July/August, because I was look for a good clipper. After lots of help from other members I finally decided on the Moser ARCO, because it has one head with adjustable lengths and is also without a cord. It comes with 2 batteries and a charger stand, so you can run it for around 90 mins non-stop. I liked the ideas of no cord, with all my fumbling around. There was no need to buy extra cutting heads either.
One member, who recommended it said a springer-breeder friend of hers has it and wouldn't be without it, so if it's good enough for her, I thought, then it must be good enough for a first timer for me.
I even posted photos of the finished results!
Chris & Co.