If you really want to upgrade to CISS like I stated before Epson is pretty much the only name in the game. And you're going to have to take the hit in color printing speed for it. The HP 564 ink series is pretty much a copy of the Canon style printer. 5 separate cartridges with a pigment black and CMYK dye. The print head construction is similar to Canon and so isn't quite as robust as the Epsons are so even if you have success installing a CISS into it there's no guarantee that it will continue to operate with it indefinitely and with the thermal print head design also if you ever run into any flow issues, and with CISS you eventually will, your print head is toast.
I went through several print heads for my Canon's just refilling, it goes with the territory with higher volume printing. Of course with burned out print heads it'll still print decently but photo's would end up with stripes. At least with the Canon's you can easily purchase new print heads. HP not so much. So if you're really set on CISS you should just go with Epson. Get an older Workforce series and convert it to a dye base CISS (newer ones don't have CISS available yet), it won't have the tendency to clog as much as say an artisan which you have to do maintenance prints on both plain paper settings and photo paper settings.