I love my Andis clippers. I'll look up the model for you, but you can use them corded or cordless (rechargeable battery). The charfe lasts a long time and they take A5 blades. The motor is super quiet. I originally bought them for clipping show steers, and I loved them so much they're my go-to clippers now.
ETA I think the model is AGR Posted via Mobile Device
If it ain't broke don't fix it. I say get another pair of Oster. That's what I use too and I love them. Andis are great clippers but don't have the torque that the Oster do so they won't last quite as long. The Oster Clipmaster is a great heavy duty large animal clipper if you want something heavy duty.
Sorry for the double post but Oster also just came out with a new super quiet clipper. I just bought a pair for my grooming business and I love them. 3 speeds, very quiet, runs cooler than the A5 did, same blades.
I like 15's for the bridle path, ears, legs, and face. Some like 10's, I don't, even for a body clip, 40's for a surgical clip, all hair is removed, I have no need for that. OP, Oster's are still my favvy brand, they last the longest I have found. Sunbeams are good too, but Oster bought them out, so they are all the same now.