I don't think any of those will bring you much, if any crossrental buisness.
Adding an external ELO touchscreen fixes most of the UltraLights downfalls, but it's still not at all
rider friendly and there will be no cross rental market.
What you loose in an ultra light is the following
-one 15" touch
screen
-built in keyboard
-1 row of executor buttons (they share the same
PCB as the beyboard)
-motorized faders
-dimmer wheel
If you are okay with these hardware limitations, its a great control
system. If you can stretch your budget, or hunt around for a while you might find a Light in your price range, and those are pretty
rider friendly; you could make $2-300 an a dry rental.
The roadhog 4 seems like a lot of
desk for the price, not real sure about cross rentals though, it seems like most people IF they want a hog, also need a playback
wing, but both should fit in your budget.
Camsys- The MQ100/200/300 are discontinued, and I dont think f the 500 is shipping yet.
I saw an M6 out on a tour recently, it looked like a pretty cool
desk, if not a little odd in
layout, but it might be worth a look.