Test drove a 2002 Caldina the other day. Contrary to many comments, I don't think these later models are ugly and the interiors apart from the poxy floor mats are fine. Not as good as my Alfa, but better than many others. I'm thinking the Caldina is more of a big hatch whereas the Stagea and Legnum are real wagons. I'll have to go back and drive the Stagea.
For a comparison of the 3 (older models) check out http://www.testdrivenau.co.cc/?tag=legnum