Looking at the digital servo listings at http://www.futabarc.com/servos/futm0211.html , they don't explicitly show a servo over 100oz @4.8v except for the 9151, but I'm not sure why a servo rated at 6v couldn't be used at 4.8 also? It's kinda confusing, b/c if you look at the 9350 and (new?) 9351, one says "N/A" and the other "N/R" for 4.8v usage - I don't dare to interperet the difference between the two meanings. Hopefully Bax or Krysta will chime in soon and clear all this up. That new 9351 is listed for 180/.15 at 6v, so if it could be used at 4.8v I'd imagine it'd still be over 100oz. But of course that's no good if it turns out to be nylon-geared like the 9151's!

Just out of curiosity, do you have anything against 6v or do you just not want to have to buy extra batteries/regulators?