Welcome to the Forum ! Let's have details of your two dogs ? Names, parents etc so I can make sure they are included in the on-line Basenji Pedigree database.
Best grinder - go to the hardware store and buy yourself a small rechargeable dremel such as carpenters and other artisans use.
Most of them come with a selection of grinders you just fit on to suit.
I have used them for years - actually three over almost 40 years. The first one refused to recharge after several years and up to eight dogs at a time, the second one was far too big and I am on my third which uses the same charger and cable as my mobile phones.
In addition, I have a couple of very ancient Resco 'guillotine' type clippers. I hate the ones the Vet always tries to use - these squeeze the nails and sort of squash them. Get a Resco. They stay sharp for years. Not sure if they are available everywhere though. Depends where you are. Mine came from the States with Marvin in 1978.