I think go for it! People will appreciate being guided as to what you do and don't need. Some people will make up their own minds about what they want to get you and some people will be more than happy to use the registry.

For our wedding we had two registries at two seperate stores. We made sure to cater to all budgets ranging from $20 - $800. We still put our "big ticket" items up there in case people wanted to do a group gift (which lots of people did). Also, you might find that the store will give you a discount on any left over items that aren't purchased by your guests.

We got most of the items from our registry but some people gave us their own gift and some people gave us cash and vouchers.