If nothing in the classifieds strikes your fancy, check out craigslist.org, where I have found many steals.
FROM MY EXPERIENCE: I personally didnt notice anything special about the ATK300 (weird right?) and I think its because of My ESP F-205. I feel that Ibanez' are unmatched in the 0-400 range, but from 500 and up theres more competition and better options. I also wouldnt recommend Schecter if you are not a fan of thick bodies, necks, and frets (having played and owned both).
Ive owned 4 ESP LTD's.
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Basically new $125 ESP F205 (retail $700)
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F204 Video
I love ESP now. A ding or two and a few years pass and the price plummets, but the sound stays the same. Seeing and playing the basses for yourself first is also recommended. I just turned 16 and went through 7 basses last year. Another good thing about buying used is that you can wipe it down, take some good pictures and mark it up
(does not apply to TB), but buying new, you can only lose money