the regas are really good speakers and, as noted, work well with your system--the only thing they lack is a lot of dynamic slam, which is not a criticism. you might try investing $500 or less on a sub (something like a hsu or a smaller martin logan)--i bet it'll liven things up considerably.
Speakers for a Rega system
I have an all-Rega system -- DAC, Brio-R amp, and RS3 speakers. Recently I have been thinking that I could do better on the speakers but don't want something that would be an over-kill for the system (perhaps under $2,500 retail?). I mostly listen to classical jazz and the room is probably 300 sq ft.