Lucm, visit the User Showcase forum and find my song Things That Go Together. Give it a listen. All during the verses and chorus, the rhythm guitars you hear are Real Band tracks. There is some human guitar in there, but that guitar on that song is 90% Real Band, as is the bass. I played the guitar part on the intro, Rog added the fills, sang the harmonies, and spiced up the drums with his drum samples. But the guitars, which are your main concern here, were Real Band tracks.

My suggestion is that you spend some time with BIAB/RB and explore. You will truly find anything you need. My CD was 75-80% Real Band tracks.