RCA MI-9584B horn recommendation

[MyLittleViking]

Anyone here have experience with these drivers?? I just purchased them and am looking for a suitable horn. It may be a bit of a stretch, but I plan on putting these in a 2-way system with Altec 416 woofers. I'm looking for good HF extension without the expense of midrange detail. These drivers extend from 200-8,500 Hz.

[MyLittleViking]

I really want to make a 2-way out of these, but would consider adding a tweeter at some point. I just really want to hear what these RCA's are capable of. Many people believe them to be amongst the best sounding mid-range compression driver ever. I am planning on going with Altec 416-8C woofers or possibly 515's, but I'm not sure they'll extend high enough.