You might just want to check out the Kaysound MK-4902 or the identical unit sold under various names around the world (Evolution MK-149, etc.).
It's the most popular controller in the world, by a substantial margin. Simple, full-size keys, no nonsense. The various brands are identical, but come with different accessories. The Evolution MK-149 probably has the most.
Long net discount, about $109 delivered (Zzounds.com).
I just got one in the KaySound MK-4902 variety at my local Guitar Center for $82 last week, as it was an open box they had used briefly for a demo.
My only real complaint with this is that's it's really creaky, so put it on a firm surface if you're running mics.