I have a fixie for simple commutes because it is a bit more robust. I have a roadie for most of my long rides. My Hardrock Sport has 35's on it now and is for training. It is nice riding a heavier bike on the road. After a while I hop on the road bike and it feels like I am flying (I actually am because I have gotten faster).
For the most part, the HiFi is strictly offroad. Mainly because I have so many on road options.