Hey Bater, you have great voice, expressive and full of dynamics, and worth trying to get the best configuration for it. Seems to me, your weak link at the moment is your m-audio interface, as isn't everything going through the in built preamps? And internal preamps on low end interfaces tend to be, as you describe, sterile. Unless you're able to bypass those internal preamps, you're probably not hearing the your current mic how it sounds through the art pre amp alone.

The search for your ideal mic/preamps can be $$$ one, so try and do a lot of research before buying anything.

Lucian