Congrats don 
I've been to an outdoor wedding. As mentioned, it's a casual feel
to it. Also, decoration and lighting plays a big part for outdoor
weddings.
I engaged Julia Wedding News for bridal gowns and photos. The
photographer does a good job and the gowns are nice. But the suits
for guys is a disappointment. I think it's a normal thing. Anyway,
TX and you are a handsome couple, maybe both you don't need nice
gowns and suits 
I also got Kelvin of Lightedpixels to cover my wedding. I agree his
work is excellent. If budget allows, Hwang of 39east is a splendid
photographer. He doesn't do posed shots though, only candids.
All said, budget is the most important. Don't overstretch
yourselves.