My "tank" is a KHS urban express (my original commuting bike). I only ride it now when the love of my life (Jamis sputnik) is at the shop... which is where it currently resides (wrecked it on wed).

I think the KHS is a great starter bike for short-commutes. and I totally think that you could make it a daily thing after a few months of getting your body aclimated. but just know that once you get up to speed on riding a bike 500+mi a month, you'll no longer want to do it on a KHS urban express. Good luck!