Nearly a month ago, I picked up a Giant Boulder SE. A week later, someone stole my front fork (SR/Suntour XC60) and rear tire. I've been doing a little bit of research and a lot of lurking around here and I've whittled it down to two options. Do I replace the parts or pick up an entirely new bike?
I was quoted approximately $400-$500 (Canadian pesos) to replace everything and upgrade to what I think was a Marzocchi MX Comp Air (though I could be wrong).
Alternatively, I could spend an extra three hundred and pick up a Kona Fire Mountain, which was initially one of the bikes I was looking at.
I'm biking primarily as a commuter but I live close enough to some nice trails that it doesn't preclude me from going out if I have a few hours to kill.

So any suggestions on my situation would be appreciated. Thanks.

Also, are mechanical discs really worth it? For the extra money to they really stop that much better than v-brakes?