I own several sets of clippers, actually 4 sets right now. Two of them are brand new and I just haven't decided whether to keep or sell them yet.
Anyhow, my favorites are my Double K Groomers Edge. These thing are awesome, but also $320 plus. They are the quietest and coolest running clippers ever. The motor is a whole separate body from the clipper head itself. I clip 7 minis every 2 to 3 weeks all summer for show. I am doing a full head to toe body clip on them and I love these things. I just move from horse to horse and never have to let them cool. Plus they are the strongest clippers ever. I have sheared sheep with these things and they are far from a sheep shear. I clip my horses on setting 3 typically and have never even used setting 10. They leave no clipper trails on the horse if you don't rush. Double K 401 Large Animal Clipper
Mine have the 12ft cable.
As far as care goes for blades, I stop every 5 to 10 minutes and dip the blade head while running into a shallow bowl of blade wash. Then I wipe the blade wash off and spray them with lube, typically WD-40. Wipe off any excess so it is not all over the horse. I have found this stuff works the best and it does not gum up the blades. I have used so many brands of blade oils and they cause the blades to gum up for some reason. I also make sure the horses are bathed and clean and I spray them with healthy haircare hair moisturizer before I clip. It seems to make the hair cut easier, but then again that might just be me going crazy too.
Yearly, with these clippers I replace any worn internal parts and also grease the drive cable that goes from the motor to the clipper head with lithium grease. The only worn part on them I have ever had to replace was a grease seal in the hand held clipper. It was easy. My Oster A5 turbo on the other hand require a new set of bearings and flange every year. Every other year they also require a new hold down clip for the blade mount.