i use/d lightwave, ace but learning curve is a mother, rendering speeds are just the nature of the beast.
Dont have stuff to show (all offline and am in work)
thinking of having a muck around with cinema 4d but not sure about if i can be bothered relearning.
Used to do 3d all the time but am gradually moving away into web and DV, cos of its intrinsic fiddliness, and its involved nature.
Bryce is good if you just want a good solid performer, i would stick with it if your needs are not likely to change