I'd go for an XR750 with knobbies, but that little Harley flat-track tank's gotta go. Get the DOT legal knobbies in case a cop stops you. They don't slide much on the pavement with the little bit of power put out by the XR, they channel water real good and they dig a nice trench in yer neighbor's backyard. I'd get a 9 gallon tank for commuting and put a milk crate on the back for carrying the notebook, etc. The crate works good for putting shaken-off parts into for later reattachment when ya get home. XR750s are a dime a dozen and pretty cheap too. Gitcha one.