How long is your commute and how bumpy are the roads?
The 650 Exec is as big and heavy as the V-Strom, but has the huge advantage of the automatic transmission. It also has a proper separate swing-arm instead of the engine being integral with the swing arm.
Any problems with the CVT tend to be expensive to fix on that model, so get a warranty on it. Make sure all the electrics work.
My commuter scooter is a 300cc machine. A major criterion for buying was that it had to be at least 100kg lighter than my main bike.