Well the RBX765A is a 34" scale I believe so that'd make it a medium scale as far as strings are concerned.
As for gauge I used the Regular Gauge (45, 65, 80, 100, 130) the advantage of these was the slightly larger "B" string compared to the Slinkies I'd used previously (.130 compared to the slinkies .125) so this gave a much better responding, feeling and sounding "B" string.
http://www.stringsdirect.co.uk/Catal...?productId=895
These're the set I'm using currently, and probably what I'll stick with in future unless I feel the need to experiment again.