Which used preamp for Halo A21, under $1,000?

Parasound just released a new pre amp, the P5. If anything would sound good with a Parasound amp, you'd think a Parasound pre would.

Mechans: I'm open to SS and tubes.

Czarivey: I'll keep an eye out for the Muse Model 3.

Daniel825: I was reading about the YS pre last night. Do you still run it with the A21? If not, what did you replace it with and why?

Runnin: I've thought about the P5, but I'm waiting for some reviews to trickle in.

I was surprised by the YS audio preamps The prices were very reasonable. It appeared to be a 12AX7 design (not sure), I wondered which tubes needed to be changed. Although I put old stock tubes in my gear where ever it makes sense.

Daniel825 and Mechans: Which YS Audio preamps have you both used? I see there are a few different models.

Agree with the Muse Model 3.... excellent, single ended, balanced and remote.... Look for the 3 Signature, an upgraded version, should still be had for $800 to $1000