Yes, they all have their strengths. I've been interested in the Vue6 Xstream thing for a while now (to Lightwave). I can't really afford the upgrade quite yet, though. Still have the Xmas bills to pay.
It'll be interesting to see the path that Carrara takes, now that DAZ has purchased it. Hopefully it'll keep the good Poser integration and expand on C5's current capabilities. Carrara has helped me out a lot in the past ten months.
Happy New Year!