Choice No. 1 has my vote in the state quarter design contest. I think you should vote for it as well.
Nintzel likes No. 2 (as you can read about in The Range when the issue's online here shortly), but I think it's too busy. As journalists, we both have very strong feelings about currency design. I don't think the obverse side of our coin needs to represent every Arizona biome. Simplicity is best, no?
No. 3 is OK; I put it ahead of No. 2. I would have been cool with just a saguaro.
Nos. 4 and 5 are bor-ing!