I can answer about the one pi tower. The Alpha 8 has an advantage over the Alpha 10 in the midrange to upper midrange. It's a bit noticeably smoother. The 10 of course has a bit more bass impact and reaches a bit lower. I used a planar magnetic tweeter, and crossover was the same point as Wayne's 1 and 2 Pi's except that because of the planar' very resistive load, the resistors weren't needed. You could just go with the dome tweeters too. All you have to do is redesign the box volume and vent. Be careful of vent placement in any tower design. (I moved the vent to the back, echoing Wayne's design on the 2Pi tower.) The basic design, by Walton? on the internet works well.
The 2Pi tower is really nice but it's a big box. Your wife may not approve.