Best width for commuter tire?

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I'd appreciate your opinions and experiences on what is considered the best tire size [width] for commuting purposes. I'm looking for a tire that has good pavement grip, is quick rolling, yet is wide enough to make the ride comfy.

My commuter bike is a rigid, steel MTB, currently running WTB 2.1 Nanoraptors (my only spares from my other - hardtail - MTB) and find them to be very comfy and surprisingly fast-rolling, yet I'm looking for something with better grip on smooth streets (ever try taking a fast corner on wet blacktop on these Nanos? :eek: ). For comparison, the Nanos replaced 1.5" slicks that, strangely, felt slower rolling than the Nanos :confused:

Any suggestions are very much welcome. Specific tire brands/models are good (26" only please).

TIA

For comparison, the Nanos replaced 1.5" slicks that, strangely, felt slower rolling than the Nanos Pump them up a bit harder!

There is a Topic on MTB Slicks: http://www.cyclingforums.com/t291662.html
Conti Sport Contact in 26x1.3 @ 90psi seem to be the winner, however Conti Ultra Gator Skins in 26x28mm should be faster. :)