opinion:
If you're thinking about C-band, then the SatAV CK-1, or WSI DMX-741 would be good choices.
The stock scalar is fine.
For regular Ku along with your C, the above might be acceptable.
However, the Ku will be under illuminated.
Maybe on a dish this large, it won't be a major drawback.
If you had other dishes for Ku, and wanted to go mini-BUD, C-band only, then probably any of the low cost LNBFs would be fine.
The C2 from SatAV would offer lots of flexibility in feeding multiple receivers.
Follow it by any 2x4, 3x4, or 4x8 multiswitch, and you could rule the world.
If your goal was just the hottest Ku-only system, then the
AF-120 feedhorn from Invacom is probably the only answer (that comes to mind).
Onto that, you could bolt a QP
F-031.
If you can deal with a bandstacked Ku LNB, then a surplus FSS from a SuperDish will bolt right up to that horn.
(I don't see the Eagle Aspen version on the Global-CM website, any more) -
