In the first tour thread, I said that a good linear ps would equal or better a battery a few times.

I got a used Power One on ebay for about $30 for my Trends T-amp, it comes in a kind of half-enclosure meant to be mounted in another chassis. It was just as good as an Optima yellow top battery with a good sized capacitor bank of both electrolytics and film caps. After that, I have not given much consideration to using batteries. Now even switching supplies are getting to the point where they can be great performers.