I went Brown.
Brown gets the edge over Thorne because he is here now and a total pro. I think Thorne is great and I thought he was a perfect match for those winning years he was here. Thorne's solid gold voice and cadence are part of the reason he's one of the best. Brown has very very good pipes but get's negative points for reminding me of Joe Buck (a compliment to any broadcaster, I guess, but not my cup of tea). Brown is distinct enough from Joe Buck, and I have listened enough to Brown, that I can discern his uniqueness.
After that, I'd go:
Arnold. I like him. Perhaps better on TV than on the radio.
Hollander slightly edges out Newman, but both are part of the family, so I am happy to hear their voices. I guess I do notice Newman's description of plays (on the radio) leave me with an unclear picture of what is happening from time to time.
Then Garceau. I loved his radio show with Jeremy Conn. I prefer the others when it comes to the broadcasts.
McDonald makes every combination twice as good to me. Palmer starts to mumble often times and I can't make out if he is being erudite or... I don't know... snobbish? Maybe not snobbish but I am struggling to find the word that depicts what people love about him that is the same quality that rubs me wrong about his style at times.