Thanks everyone. I went with a 39x16 for now, and will probably go up to a bigger gear in Feb/Mar when the season approaches.
Being a roadie, I wanted to try and keep my position on the track bike relatively close to that on my road bike, so I had to jack the seat back a bit on my cannondale track bike, as the seat angle is steeper.
I generally run 172.5's on the road, and am using 170's on the track bike. I feel the shorter length will help with my spin, but not be too much a difference from my road bike.
After riding this thing around for a couple weeks now, I am getting a much smoother spin, and sore muscles in places I didn't know I had muscles! haha.
I wish we had a track within 6 hour drive of here, It sure seems like a whole lot of fun.