I disagree with the "Don't push it too far" bit. Did you guys happen to see anandtech's atical on the Gigabyte's card using the R300 core, they had incredible results.
<A HREF="http://www.anandtech.com/showdoc.html?i=1686&p=4" target="_new">http://www.anandtech.com/showdoc.html?i=1686&p=4</A>
"We played around with the settings and managed to overclock the R300 to an incredible 400MHz, an increase of 23%. The memory was only able to hit 337MHz DDR (effectively 674MHz), an increase of 8% but the core overclock was by far the most impressive of the two numbers."
But I think before I try to push it, I'm gonna get a Thermaltake mem cooling kit (using the heatsinks for the Card's RAM) ???and get a 20-30% mem speed increase???, and maybe a bigger/better fan, that's the only mod Gigabyte used, I'll also test it with my case open. I'll let you know how it does. TBC..........