I'm unfamiliar with the X6500, and Google isn't helpful. It points toward the Nvidia 6500 card, maybe that's what you meant. Nvidia cards are very inefficient for mining because of the way they work internally, versus AMD/ATI.
Your best bet to buy something for around $600 to mine with, and works with USB, would be the Butterfly Labs Single.
Looks awesome on Android, thanks for the contribution!
You should consider getting a domain name for this if you're passionate about it. In fact .mobi domains are like $9/year through moniker and I found one or two that are relevant and only a few characters.