yet another cam question

So I've been reading a lot of the posts in this forum about various cams/engine builds, etc and what I've learned is that I have a lot to learn. So here's my dilema: I ride a 2001 FXST, carbed with a Ness Big Sucker and a Thunderheader. I weigh 200 lbs and ride solo 99% of the time with no bags or extra gear. My engine is stock except for the above mentioned mods. I would like to change over to a gear driven cam that will work well with the stock engine but also leave the option open for a big bore build later down the road. I'm pretty set in my desire for a geared cam as I don't want to ever worry about cam chain tensioners going south on me. I live in Northern Calif. with relatively low humidity and fairly stable weather. I ride mostly backroads, but the freeway is a necessity to get to some of the primo riding areas around here. Primarily, I would like more passing power on the interstate. I'm thinking Andrews 37g. Your thoughts?