Paul,
I use D'Addario XL Nickel Roundwounds; gauged .130 (B) - .095 (E) - .070 (A) - .055 (D). Those particular gauges are nearly identical in tension to each other on a 34-scale; which is what my current - and upcoming - basses both are. D'Addario's website features a VERY handy gauge/tuning/tension/scale computation chart which I used to arrive at this particular combination; and they feel VERY even in tension across the neck. If/how it would be at all applicable to other brands of strings is questionable; given the differing core/outer wrap ratios each manufacturer utilizes, among other details. I seriously contemplated utilizing a .145 (A) - .105 (D) - .080 (G) - .060 (C) setup, but chickened out at the last minute. Hey, if anyone out there is adventurous enough to try THAT idea out, I've got 2 full unused sets of THOSE strings layin' around (D'Addario XL's) that I'll let go CHEAP! Anyhow, I hope this helps.