The BIG question, is what do you want to do? Everybody has their reasons for yes or no. Are they same as yours? I personally don't carry, and normally shoot 4" + at the range. The 66 would be harder to replace! SO, you can see that the tough decision is YOURS! Do let us know how you make out! Bob
I wouldn't do it. I think a 66 2.5 inch is a scarce gun.
The best thing I can tell you: do what you want, but keep in mind you'll likely never get another 2.5" 66.