I'm a firm believer in registering for your wedding, bridal shower and engagement party. I don't think it makes a couple look greedy and you'll make it easier on your guests if you tell them what to get you via a wedding registry.
Now you could just go to the store of your choice and run around with the clicker and add any and everything to the list, or you can decide to add only the items that you really need and want for your home.
But how do you know what you need and want and really use. Simple, take an inventory and think about your entertaining style.
If you and your fiance love to cook, register for a great set of pots and pans and cooking tools. If you love to have people over and entertain, register for a complete set of china, barware and flatware. If you love to relax in the bath, register for luxurious towels and new bath accessories. If you haven't bought new bedding in years, register for pillows a comforter and new bed linens.
It's okay if you end up changing your mind and return/exchange some of the gifts you receive. I wouldn't tell someone that you returned their gift but just know that it's okay to if you need or want to.
No matter what type of gifts you register for, it's still important to register for items that are less than $25 as well as pricier items for group gifts.