Love the tips on how to use the hole saw: rubbing soap on the outside and drilling a swarf removal hole where the saw cuts. Thanks!
I ordered a saw, but it's not here yet. DW-505K was my choice. I may fabricate a bracket to prevent it from twisting, if that is a problem. ON the other hand, should I break off all my fingers and both wrists, you may never hear from me again.
PS: Critical factors in the decision making process were weight, 2 speeds, and the experience I already have with the hole saw. Also, the supplier offering a 3rd year of warranty.