When I tried the BB for Jackson, I paid around $80 off Amazon. Actually I think it was closer to $90 with shipping. I really really liked the looks of it, the feel, the leather, but it just did NOT fit him right, unfortunately.
If they ever make a size 5.5, I'd be all over it. Look into the Choke Free leather if you want a bit cheaper but still a good harness, we have it and love it but our favorite is still Puppia for convenience, safety, price and quality.
But yes my big boy is a solid 16lbs and I don't even use a collar on him. He still has a pretty sensitive neck and will gag at a very slight tug so I don't want to risk anything. Plus, I feel the harnesses are less easy to escape out of.
I don't think I'd ever even use a choke or a prong on a big dog. I walk a Lab and a Rottie, both of which owners use prongs and I've had BOTH dogs get them off pretty easily! The Lab simply sat and scratched his neck for all of 2 seconds and the prong slipped off, and the Rottie rolled around on the ground and same thing... slipped right off. I don't find them reliable and I don't think they work ALL that well. Chokers are even worse, IMO, than prong collars.