There are so many options out there! There are non-stretchy wraps (like the ellaroo the pp suggested, as well as many other brands). They are super supportive and you can carry a baby in many different ways--front, back, and hip. They do have more of a learning curve but since you've been using the ultimate baby wrap, maybe a good fit for you. Versatile and very comfortable.
Then there are mei tais...like the Baby Hawk, Kozy, and many other brands. (Creative Kidstuff carries Baby Hawks). Basically, this is a rectangle of fabric with long straps coming out of the corners. Again, you can wear it all the ways you wanted, and I think they're easier to learn how to put on. Also they have tons of fabric options, if that matters to you.
There are soft structured carriers (SSCs) like the Ergo (can be purchased locally at Peapods, for one). This has a heavily padded waistband and is great for back carries. It's sort of like a soft little backpack you put the baby in. They can be worn on front, too, and I know I've seen pictures of some worn on the hip. There are a lot of other brands that can be found online, too, like the Beco (pretty fabrics!), Ten Toes Click, and more.
There are ring slings and pouches which can be great for hip carries. Peapods also has some of both of these. Some Targets have Hotsling pouches, too. And Kangaroo Korner is a local company selling adjustable fleece pouches (as well as a lot of other slings).
My advice would be to go to www.thebabywearer.com and look at the reviews section and at "choosing and using a carrier" under the forums. There's also a For Sale or Trade section where you can pick up a carrier for a reduced price.
Finally, this Saturday, Nov 3rd, the Twin Cities Babywearing group is having a meeting at the Peapods studio space in St Paul. Meeting is from 12:30-2:30 pm. You can try a bunch of different types of carriers and get advice about what might work best for you. They do have a lending library too.
A lot of info, I know, but there really are so many beautiful, functional, and comfortable carriers out there--just not at Babies R Us. I'm sort of (okay, very) baby carrier obsessed so I'd be happy to answer any questions if you want to send me a private message. The biggest thing is just to not give up if the first thing you try isn't comfortable for you.