I like Atari, & I like the os, but not allways cos it is best at everything, but it is really kind of simplistic to use, more powerful in what it can do than in other machines.
Personally I would use an Apple Mac 840av type machine, this is well built, but I would use Gem on it, Apple os just dosn't do it for me.
Now, if you wanted to sell me a re-designed st this could well work in the same vain as the PSx to PSOne type concept.
That has already been done with the 2600 huh? cos of the new Atari game thing.