I just got a sling for my DD - it's a slingling. They are a little tricky to size, I found. I ordered mine according to the chart the website gave, but it was still too big. Thankfully I could shrink it in the wash. Comfy Joey also makes beautiful slings. (google.) The hotslings website has a sizing chart that is apparently not so great - go down a size or two is the advice I've heard.
Anyways, all that aside, I LOVE my sling. I also have a moby wrap, which I love. Different uses - wrap is great for keeping a newborn cozy, (she'd sleep INSTANTLY and I could wear her for ages without getting sore or tired) and for longer term wearing. The sling is wonderful for a quick carry, especially now that she can go on my hip. Very quick and easy and comfy, although not great for long carrying.
theslingdirectory has a list of hundreds of different carriers with reviews and price ranges. (all one word, the usual beginning and end. )