Upgrade from Parasound Halo A23?

I'm interested in upgrading from my Parasound A23 amplifier which drives a pair of ProAc Response SC1's through a Meridian 562v preamp (with Meridian's built in D-A converter). After about 6 years with this amp, I think it's time to move up a step or two. Don't need a huge amount of power, but would like something a little warmer. Recommendations?