Bryce 5 is really cheap...but it all depends on what you are looking to get out of the application. Bryce is probably the best bang for its buck but if you NEED a faster renderer/ better overall program...than you may want to look into some of the higher end ones. However, Bryce is by far the easiest GUI Ive used in any 3d app (or most apps for that matter). So if your not willing to put up with a changed interface, then opt for Bryce 5.