Yet another Amp recommendation needed

I'm in need of a recommendation for a SS amplifier for my office system. I'm thinking either a PS Audio Stellar S300 or a Parasound A23 Halo. Other gear in my office rig include:

Audio Research SP-9 Mk. III preamp
ELAC Uni-Fi UB5 speakers

I'll probably good with either amp, but any of you out there have any thoughts? Thanks in advance.