I'm looking for a decent headphone practice Amp, so I can effectivly practice at work. In your Opinion what would you suggest for a decent set up. I was looking at the Bass Ace or the X-100 by Tom Scholz (headpphone unit). I have seen a few older ones for sale when the manufacturing department was called SRD - Scholz Research and Development. That one has more fetures in the design and looks like it may be better. Who else has what I should be looking for Are there any other manufactures out there making what I'm looking for? (Headphone practice amplification) Any help here would be great.