you wont get anything that could be desctibed as good for that money, it will fall to pices very very quickly, be wobbly under power, harsh over bumps, and heavy.
Cannondale R500/R600, or Trek 1000/1200 (or the newer 1 series if you can find one in budget). Both can be found for well under your budget on ebay/classifides. The Trek is lighter and harsher, the Cannondale is much more comfortable thanks to the hourglass stays. The cannondale is phenomenaly stiff under power thanks to the mahoosive down tube and huge welds arround the BB. People on carbon wonder bikes often compliment it and one of the roadie mags rated it as one of the best frames they'r ridden (up there with some retro steel exotica and the kiron scandium/carbon frame).