I am about to buy my first bike. I will be riding mostly road but with some off-road, mostly flat paths.

I've been searching for a while and have decided on the Diamondback Trace.

The 2013 model has disk brakes and is $450.
The 2012 model does not have disk brakes and can be had for $370 on clearance.


Is it worth it to get the disk brakes or should I go for the older model without them and save $80?


p.s. I am 6'2" and 190 lbs. An online calculator told me that I should get the 22" frame. Does that sound good?


EDIT: I could also just spend $320 on a Diamondback Response and use all the money I'm saving to get some road tires. Would that be worthwhile?