We're in the Hotsling camp too. You can check out their website for info at www.hotslings.com. They have all the info there regarding sizing (size charts and suggested ways to get a good fit), ways to wear the baby, videos, etc.
They are a bit pricey, but I got my first one at Target for $19.99 (I think it was a discontinued fabric and had an "as is" sticker on it...no defects). I liked it so much I wanted a second. The Target one had a print I couldn't wear with everything. So, I got the black sateen Hotsling for $20 on ebay.
One thing to note....the sizes are interesting. It's like with jeans...you know some people can wear a size 6 or a size 8 depending on how you like the fit? It's the same with the Hotsling. The Target sling, I was right on the border of sizing and the sling was a size 3. Because it was the ONLY one at that price, I got it. It was a bit roomy for my taste so I just washed it and dried it (website says you can try that to tighten it up a bit). It shrunk down to a size 2. My ebay sling is a size 2 and when you hold them up to each other the sizing is identical. So, I guess my suggestion would be to size up if you're on the fence because you CAN shrink it up in the dryer.
