I recently started bike commuting. So far I have used a backpack but want the option of a rack and panniers as well, and had some questions as I have never used a rack and panniers before.

Any recommendations on a rack that can fit a road/touring bike with disc brakes? Preferable something that is reasonably strong but not to heavy. Not too concerned about price, want to get a quality product.

Also what about panniers? Will sometimes need to carry a laptop (13" MB Pro), and typically carry basic change of clothes (not shoes), tube, maybe lunch and a lock.

Am I better of with a single pannier on one side, or will that make the balance odd? Looked at some double panniers such these from Timbuk2 or bontrager
http://www.timbuk2.com/tb2/products/...ke-pannier-bag
http://bontrager.com/model/09563

Could also do 2 single panniers and use 1 or 2 depending on what I need to carry each day.

I do want something that I can then carry from my bike to my desk easily, so a shoulder strap or good handle would be nice.

Any suggestions? Don't want anything to large. Waterproof or resistant would be nice as well, but not required.