So far, I'm very pleased with the K10's - have not used them out on a gig yet, they are in my studio. I did debate for a while whether to get 10's or 12's (12's seem to be a real good fit for keyboards), but decided to go lighter and smaller.
I've got a pair of JBL EON 10G2 - did use for gigging, but they would get hot and reduce their power (built-in thermal protection circuit) - they are now in the lifing room for the family keyboard, a PC2X. The pair of EON15 G2 are at church handling my keys rig there.
I have a pair of Electro Voice SXA-100+ 12" speakers that I am using for gigging. Great sounding speakers. I've been told that the SXA-350's are better sounding - but these were my best before I got the K10's. Right now, I'm not sure which are better overall (but the K10's are smaller and lighter - also rated higher power).
The PC3 and Electro 3 complement each other nicely. Just got back from a gig with the country/gospel/oldies band - I carry one of the EV's and the E3, stand, cables, pedals - all loadin in 1 trip if I really try, 2 trips if I take it easy. I haven't carried both boards out yet, although I carry the E3 to church and use it for Hammond, with the PC3 for other sounds.
I don't often have to play key bass (although if I have a gig with that, I can carry my Trace bass amp and the 2 cabs for it - but they are old-fashioned, bulky and heavy). Either the EVs or the QSCs seem to handle piano, elect. piano, organ, and orchestrals well.
I hang on the MusicPlayer Keyboard Corner a good bit - a lot of pro. players there - and good info shared on equipment and technique. About the only other piece of equipment that I would even like to have now would be a Ventilator for the ultimate portable Leslie effect.