The above is made by Sequence and has a better price point, the confusing part is that in the pdf file on it has both 18 month and 3 year warranty listed.
I am leaning towards a Sequence 4000 -3600gph but the Sequence 750-4200gph draws less power and has close to the same output at 10' head pressure. Not sure how much more head pressure a bog can require, that is why I am favoring the 4000 with 21' of max head.
The price is better on the Quiet Drive