Originally Posted by
bikemig
I'll give option no. 3 which is to buy a used vintage mtb with a rigid fork for commuting. Seattle is an expensive market but old used mtbs tend not to be expensive when compared to road bikes. You may find this cheaper than making the changes on your mountain bike and you'll end up with a heck of a nice old bike.
Nice old Specialized. Sure that it is a great riding bike. Check out the long chain stays, comfy/functional handle bar setup, quality saddle, tires, and wheels.
All it takes for a very nice commuting ride.
Good job and thanks for sharing for the OP.