opinions on wiring tweeters differently

I'm going to go with those TB tweets I posted in a link. The 1" with what looks like a small rear chamber. Fs is 900hz. And if I go to the trouble of making new x-overs with better caps, I might as well drop the $60 and change my woofers to the 4ohm version of the ones I have and effectively double my power, and according to the sensitivity ratings, increase the volume by 3.4db. My system was designed before they made the 4ohm version of that same driver. It'll also match up the efficiency between the woofers and tweeters so I won't need to pad the tweeters as much. Mainly my urge to go with a second order filter is to keep the size down. Those audio grade caps are a lot bigger than the electrolytics. Thinking in terms of packaging both the high and low pass filters in one box, if I start throwing together 3-4 of those caps and 3-4 15ga air core inductors along with a zobel and an L-pad, I'll need a pretty large box to fit everything, one on each side of the car, and space under the dash is limited.'96 Mazda Miata