I am looking into a similar purchase. I will probably go with the Kifaru bikini frame, a grab-it and a daypack/compression pack - likely a HPG Tarahumara. HPG don't seem to be supplying compression kits at the moment which is a small problem, so will be add some straps to my Kifaru order.
HPG DOES sell the compression straps individually, look at their site. That Tara is a tad small for a daypack. That is why I went with a Tara Pocket (lighter) as a compression panel.
I've not seen a Bikini Frame, but I've read that some have encountered issues due to its narrow width. You don't have the loop locs on the edge of the frame like you do with a Longhunter. Careful packing, to maintain a non-barrel shape of the drybag would help. Some over at Rokslide have put this set up together.