Sweet potato advice

I’m planning on growing sweet potatoes this year and wasn’t sure what varieties to grow! Last year I grew slips from purple sweet potatoes from the grocery store, which were delicious, but I wanted to try some new varieties this year.

I was thinking of ordering slips from Sand Hill Preservation center. Has anyone tried any sweet potato slips from there and have any recommendations for particular varieties or where to buy from? I’m in zone 6a and was mostly looking at ones described as early