I really think that for your set up RB will the cat's meow .. the bee's knees, so to speak.

Remember, if you are more comfortable in BiaB you can still start the song there, then when ready to add the Nord and other tracks just open the BiaB file in Realband.. and record away. Chnage tracks to different softsynths, etc etc

I like the multiple audio tracks and multiple VSTi features compared to BB.

I do not work here, but the benefits are still awesome
Make your sound your own!