I am doing my reception outdoors at EPCOT instead of doing a reception and an Illuminations party. We will be there for Illuminations and will pay the viewing fee, but this way it's all one big event. We do have to use the disney transportation still for me to wear my dress.
One other thing to mention - if you're having a small group come to the party, you can hire a limo to drive you instead of the motor coach. It's a little cheaper and with a shorter min than the bus. Also, my EM did say that we could just use the limo and the guests could come in via the front gate because they wouldn't stand out as much as a bride and groom.
As with everything Disney, you've got tons of options, just depends on how much $$ you want to spend.
Good Luck!