As someone else pointed out, your bike doesn't weigh 35 lbs.

Getting a fixed gear bike as lightweight as your current bike will be expensive. Most SS/FG bikes are heavy, in part because they are heavy. Bikes as lightweight as your road bike are expensive because they're lightweight.

I concur, about a 70 inch gear should serve you well over flattish terrain. Get a flipflop hub and you can have fun trying out the world of fixed gear cycling (which I prefer).