You could always upgrade to the X800 XL. Since they're pricing is similar, you can probably sell it for more than you can buy it and make a profit like I do when upgrading. =)
Remember, on eBay people will get caught up in the bidding and bid higher than it's worth! ;P
X800 Pro's are on the 130nm low-k core, so they're very overclockable, get a waterblock on it, a pencil volt mod, and you could pull off 600mhz on the core.