I'm using an SRM-323 with the 009 and it works great. Obviously it's not the best (biggest problem is a lack of bass), but I mean it's only $350-400 used. And the 727 is just as good as the 717 if you can do the resistor mod.
I think a KGSS is going to be my next amp (If anyone has impressions of the KGSS/KGST/HV vs 323 I would love to read them). Next is a KGSSHV or KGST and then I'll be done for a while.