On the subject of the YX 12's I agree completely. I actually took a pair of YX10's out this weekend to make up for the two missing E210s and they were amazing! If it weren't for the fact the I'm running 375w RMS per box I'd just commission a few of them and be done with it. lol
YX15's
I'm not even sure what all is available for monitors from Yorkville. They YX12's fit my budget at the time, and I've never had the need to replace them. I've only ever replaced a horn driver once, over countless numbers of gigs since 03. Did a bar gig last night for a full on metal band. They were really happy with the monitor sound. Plenty of volume, they liked the mix etc etc.
I would definitely buy them again.