From a 53lb. Kettlebell to a _ _lb?? Need help…

Currently using a 53lb. bell , and have been since January. 6′, 214lb male at 10% body fat, whittling down to 205lb.

Began with basic swings, kb one hand military press, squats, etc., before working up to snatches. Currently do roughly 120 snatches in sets of 10-15 in 10min. without great difficulty, twice a week. Have done sets of swings totaling over 300 with exhaustion at the end, but not pain.

I want to get a higher weighted bell for lower rep work, and simply to push my strength.

(I’ll still keep and use the 53lb.)

Question is – would the folks here recommend a 70lb? or jump to the 79lb?

They aren’t cheap, and finances are limited, so I need to make the choice wisely.

Any advice would be greatly appreciated.