The EQ-500 has been discontinued, so you will likely have to look at the used market to get one.
Any real experiences with a Luxman C900u and C10x?
I'm in the market for a new preamp and have the M10x and am leaning to the Luxman C900u or C10x. There aren't many dealers around me that have both for me to try and there doesn't seem to be much info on both online (i may not be looking in the right places 
)