My choice is oregonpatchworks.com. They have a large collection of digitizers and each week, they have specials with discounts of anywhere from 25% to 75% off. Within one selection, there will be 10-15 designs and each is offered in several formats. They showcase four digitizers each week. You will also find a few free samples. I think their selections are great. Take a peek.
I have and use my Bernins 830.