I agree. The Zalman VF900 is the best aftermarket cooler available.
Do you already have the 7600GT? If you don't, get an eVGA. Their warranty lets you change the cooler and overclock it without voiding your warranty.
Or, you could get a passively cooled Gigabyte 7600GT, with a heatpipe cooler that actually outperformed the stock fan cooler.
Or, you could get a 7900GT from Gigabyte with a Zalman VF700 already installed and pre-overclocked.
Decisions, decisions...