Thanks for the tips guys. Like Lynn said, my objective is to create a space in which it sounds like all the parts are performing within. Nothing heavy-handed. Perhaps it's more of a blending effect than anything. And as is often the case, less is more.
I think I'll set up Breverb on a buss and send varying amounts of it to the various tracks. For Lead vocal, I will probably also add a little delay as well.
But of course, I'll experiment with my other reverb options as well.
These days, I'm trying to work within Sonar as much as possible using as few outside resources as possible.
Thanks.