I have the 39 dollar manual changer from Harbor Freight. I also have the 80 dollar bubble balancer from some where. I change and balance 40 to 50 tires a year mostly at the track since I regularly turn tires on the rim to get another session out of them. I have a couple of holes in the floor of my trailer that take a couple of  bolts to locate the changer it works great. Remember, changing a tire is a finesse thing not brute force. It is actually pretty easy. I run these tires up to 150 MPH with no issues. I have found that if a tire takes a lot of weight, it is not for me. Typically the ones that need more than an ounce have some issues I do not need at 150 MPH. I have lost several over the years that took a lot of weight but now just send them directly to the scrap heap since it is cheaper than a ripped up fender or worse. If I were doing hundreds of tires a year, I would probably buy the two thousand dollar variety but would still take my manual unit to the track. If I were doing it as a business I would have the spin balancer too since it sells better. Most modern tires are so good new, they take little weight. I have found that if one takes a lot of weight that a bead break and reseat sometimes fixes sloppy work or lack of lube on the bead to help it seat even. Also a few trips around the block and a rebalance can some times make things better too.  Good luck!