The 230F is only a inch or two higher. The 150 is light and ideal for tracks, but has less power than the 230 (obviously). For your riding i'd go with the 230 because you can go pretty much anywhere you want. AND, if you do get into going to tracks, you can always change out the suspension and maybe uncork the bike. Most people like to be able to touch the ground on their bikes, the 1-2 inches might be uncomfortable for you but keep in mind you can always change the height of the shocks.
About wheight, the 230F is heaver. Mainly because it has a steel frame (so does 150) bigger engine, and comes with a battery for electric start. 150F 2006 models also have electric start, thus making it heaver than the 2005 model.
Stock wheight on 230F is around 235 pounds.
Stock wheight on 150F 2005 model is around 215.
Stock wheight on 150F 2006 model is around 225.
Personally I don't feel the wheight of the 230 anymore (i'm the same wheight as you so it should be the same). Less wheight is nice, but you'll learn to use the extra wheight to your advantage after a couple times you go riding, and then not even notice it at all.
The 230F sounds like the perfect bike for you, though the 150F is also not too bad. They both get around pretty well, so I suggest to go sit on a 230, and keep in mind that you can lower it if you want.
Happy shopping
