I know that I'm a little late to the party, but just wanted to throw this out there:

Dillon Music makes two very good Piccolo models in the $500-$800 range; one has the 4th valve, the other is a copy of the 3+1 Yamaha design that is fairly popular as well! I just recently sold my Dillon 3+1 (upgrading for grad school), but I was very happy with it for about 4 years.