OK, well here's the answer:
0m:0s Start (guitar A) : Guitar 3 - Spruce/Indian rosewood
0m:49s Start of first repeat (guitar B) : Guitar 1 - Spruce/Maple
1m:38s Start of middle section : Guitar 3 - Spruce/Indian rosewood
2m:20s Start of last repeat (guitar C) : Guitar 2 - Cedar/Brazilian
Congratulations Pacfan and Lemonsieur - the only 2 correct answers out of 11. The probability of getting it right by guessing is 1 in 6, and the correct answers were 1 in 5.5 of the total.
Less than half identified the cedar guitar - which surprised me, but I think I would have found it very difficult to separate the maple and rosewood spruce tops - I think the difference is too subtle to really hear on this quality of recording.
Anyway, thanks for playing the game. If any of you are coming to the GFA convention in October, you can compare my maple and rosewood guitars in person.
P.S. I'm still looking for somewhere to stay in LA for the convention in October - any offers?