Heights are not going to make a huge difference. I run heights (and DSX wides), and while I definitely like the effect it adds, it is fairly subtle. I'm using RC-70s for L/R, RC-LCR for center, RC-30s for wides, RC-micros for the heights and RC-R for surrounds. I would recommend RC-10s over the RC-micros if the budget and placement is there. I like my micros just fine, but the RC-10 is just a more capable speaker. Don't expect a jarring difference with either speaker though.