Ace,
Life support equipment is not automotive equipment. It will not fail at an opportune time!! The problem with letting something go till it "acts up" underwater, your options are SEVERELY LIMITED!! Why limit options, when prior to diving, one has all the options? You have the additional concern of diving with your wife, and I can not think of a more tragic event than to be the witness to loved ones demise. And to think that maybe you could have done something to PREVENT IT? That is not something I want to contemplate.
If your reg fails right after servicing. It isn't the service, but rather the monkey who is messing with it. Find a tech. who does know what they are doing. Spends some scuba bucks on a GOOD service. After all it is only the thing keeping you alive!
How important is that?
Only you can be the judge.