If you don't mind putting your laptop into it's own sleeve, I use a Camelback Explorer. I myself like a waistbelt, since I have a semi upright position I use the waistbelt and loosen the shoulder straps to let the air in between my back and the pack.
I had an old Timbuk2 Swig that I gave away, you can't go wrong with the ruggedness but getting sweaty back syndrome on 30 degree days is just wrong. On most days I have the waistbelt wrapped around the pack but when it's especially warm or I have a heavy load, I am glad it's there.