Don't worry if the amp is "Audioholics quality". We're generally into this for musical pleasure, not gear snobbery. It would probably be a good idea for you to view amps from a practical standpoint (based on speaker sensitivity, room size and distances to the speakers, etc), and get picky with speakers, as they by and large dictate the quality of the sound you'll get.
That being said, that amp is modest. If you decide to go with speakers that are similarly or less sensitive than the ones you currently use, you may require more power. If this is for a desktop/nearfield rig, maybe not.
In order to get an increase in volume with new speakers, the new speakers would simply have to be more sensitive than the older ones. (There would still be other qualitative differences, so no guarantee you would enjoy them any more, but they would get louder.)