Kawai MP11 would probably be my first choice, if travel weight is not an issue (it's about 70 lbs). If it's from a rental company, they might have the older MP10, it's good too. If you want something lighter, you could look at the MP7, though I don't think the sound is quite as good.
After the Kawai, I'd say any of the Nord Piano models... but in a rental situation, what's tricky there is that Nords have many different piano sounds you can load into them, and you won't necessarily know which ones are loaded into the one you get. Ideally, you'd have some time with it in advance of the gig, so you could load your preferred pianos into it, if needed.
I haven't played the Kurzweil Forte, that's one that I'm curious about.
Personally, I don't really warm to the Roland and Korg pianos so much, but it's subjective. I like Yamahas... the aforementioned CP300 is enjoyable to play but is not state of the art sound-wise (it came out in 2006). The more recent CP4 or CP88 would probably be better choices there.