Both my 5s are 35" scale and I use a 40, 60, 80, 100 set of D'Addario's - either XLs or ProSteels. I used to use the 130 B strings that came with them but Mark @ Bass Direct (yes, him again!) turned me onto a taper-core 125 from R Cocco. This has evened out the response and I'm sold on this now.
On my 34" scale 4s, I use one gauge up for fretted (45 - 105) and one down for fretless (40-95). If I were to get a 34" scale 5, I'd use these plus the B string above. This, of course is pure speculation as I don't have one right now. YMMV, as they say.