I'm using my SD-SG11 with 8 ohm speakers that are 89db, and I am finding some limitations on how loud I can play it before it starts distorting. On a volume scale of 0 to 40, I start noticing some clipping at around 25. Of course, for my use in a relatively small room (11'x11') belonging to my toddler, I don't really need to go any more than 22-23 on the volume setting. But if your room is bigger or you expect to play louder than slightly-more-than-background-music, you might want to find speakers that have higher sensitivity. Also, keep in mind that the 25wpc rating listed by Sharp is into 4ohms, not 8ohms...
Otherwise, it sounds great! And yes, the tuner isn't bad...