for that price range, i like the soma rush. http://www.somafab.com/rushpix.html
the LBS has one built up with velocity aero rims, black tires and cinelli drops. it looks way cool. i really like the fork on this frame...

for a classier italian look, check out benotto. http://www.trackbikesource.com/standardtrack.html (bottom of the page)
and for a couple hundred more check out the torelli and cinelli pista frames.

since you already have a bianchi, you might like the olmo gara pista: http://www.bikecult.com/works/sales/olmopistaframe.html
i personally don't like the round forks on these bikes...

the other obvious choices are the surly and KHS frames. you might like them. i don't.