Other than the Accuton, I've used every driver mentioned. In every case, with good crossover work, the finished product would be very good. I think that your letting the price of a single driver get in the way of the finished product. Peter mentioned one of his kits and it is very good. Not sure that you'd want to go the DIY way at all, but considering your comments on a few parts listed, these should fit the bill. These are Morel Parts, the tweeter is similar to what you listed, except this tweeter offers a bit more detail than the 30. These were designed by Jeff Bagby, a well known and valid speaker designer by any standard. Basic cabinets are included, but you'll need to do some cabinet work to bring the cabinets to the level of a $5000 retail speaker... the speakers and design itself will hold up sonically at that level.... these are $1000 a pair.
http://www.parts-express.com/solstice-mltl-reference-tower-speaker-kit--300-708
This might be way off from where you were going, but I thought I'd throw it in.
http://www.parts-express.com/solstice-mltl-reference-tower-speaker-kit--300-708
This might be way off from where you were going, but I thought I'd throw it in.