Dear Robert,
welcome to the Forum.
With my Genos I use Yamaha HS8 monitors, just perfect. They will give you full response on any range and more the enough power for home audience.
I strongly suggest to get HS8: the HS7 (that I have tested before the purchase) are OK too, but the HS8 have totally different capacity in reproducing bass. So well that I did not need to get a subwoofer. Two years after I got the HS8, I would definitely buy them again.
Also the price/quality ratio is very favorable.
In any case, another advise is about WHERE you put the monitors. I have them a little behind me, quite distant, in order to get a good stereo panorama.
They sit on K&M monitor stands, with the tweeter at the same height of my ears (when I'm sitting to play the Genos).
About the original Genos speakers, they are not bad. But HS8 are another world. You'll get the real sound of Genos.
Hope this helps...
Ciao
Angelo