PHarker,

suggested "latencymon" has almost nothing to do with BIAB. Your computer is modest...but it will be fine, since BIAB is not a live arranger. Just generation time might be slower than on fast computer, but once generated it should play ok.

You are right, BiaB Ultra is the way to go, as it offers most content. Only thing to consider, your hard drive is small for Ultra Pack, but you have an option to ship external drive with Ultra Pack from PGmusic. It will require base program files installed, but you can run BIAB Real Tracks from that external hard drive, without full installation.

Suggested Real Band is more like a DAW like program, which is not used by most for various reasons. BIAB will fully suite you to make custom realistic backing tracks / loop section to practice guitar.