What do you dislike about the Sherwood reg setup?
If it's a performance issue, I wonder how long it's been since your regs were serviced and whether your reg tech is tuning/adjusting your regs properly.
There are lots of people out there who absolutely love their Sherwood regs.
If you insist on upgrading your current setup...
herman's idea about installing an affordable balanced 2nd stage on your existing Sherwood 1st stage might be the most cost-effective approach.
i was just looking to upgrade a newer set of regs. and give my sherwoods to my wife when she gets certified. ive only been diving since june 2011. i bought used from a fellow diver and have never had them serviced since i bought.