I agree that it totally depends on your circumstances
I just wanted you to know what you could be getting into if you didn't know already!
Again, technically, ettiquette says you shouldn't put your registry information in your invitation. Period. That includes registry cards that you slip into your invitation-- the stores don't give those to you because they're helping YOU out, they give them to you because they're directing people to buy something from their stores. We chose not to put our registry information in our invites because I had LOTS of family on my invite list who would have been offended and because I think the rules are there for a reason. Instead, we included our wedding website on the invite where there was a TON of wedding info (directions, hotels, places to eat, etc.) and included a link to our registries there.
And Emily Post would be okay with registry info on a bridal shower-- someone else is throwing you the party-- you are not asking for gifts yourself. That's the "technical" difference.