I was in the same boat. I couldn't even decide on which to do as the STD or the invites. So you are a step ahead, you know what you want! I decided I am doing boarding pass STD and passport invites. There are so many I just couldn't choose the vendor. So, I checked out almost every thread on here that had STD boarding passes with pics & emailed 3 vendors for pricing. That helped me determine who to use. So needless to say I am going with Rebecca. Her response was the fastest & the pricing seemed resonable to me. Her work looks great! I do not have a pic yet of my STDs because they are still in design mode. Here is her info:
She also has her stuff on etsy.com too.
Allurements by Rebecca
Also, if you are crafty(which I am not at all!) there are a ton of DIY templates on a bunch of threads in the invite section.