How long are you going to be gone? I prefer Park n Ride, which was $9/day the last time I was there. If I'm going to be gone more than 3 or 4 days, I'd probably use one of the private lots on Camp Creek Parkway. They are cheaper but a little farther away.
I heard the Renaissence Hotel would pick up up and drop you off from a small lot across from the FEDEX parking lot, you just have to tip the guy like $5 or so. I have not tried it yet. Right now i am also looking for a place/ hotel to park . Let me know if you find something or send me a message, i'll try to post something here if i find a place