7.0 FX 7.0 FX - Trek Bicycle

vs

7.2 FX Disc 7.2 FX Disc - Trek Bicycle

$180 price difference between these two. With FX Disc, you will get disc brakes, little better components, and additional gears (7 vs 8). I think it's well worth the upgrade to 7.2 model. It's your choice and your money. Either model will be fun anyway ;-)