My son loved to face out too, and we used the Baby Bjorn Active until he was 20 lbs and my poor shoulders couldn't bear the weight any more. I also read how the baby is basically hanging from the crotch area, which sounds a little painful.
The Ergo carrier is designed to have your baby face you. I was concerned my son wouldn't like it but he loved it, because he was able to sit very comfortably and even nap or nurse. He liked it better than the Baby Bjorn. It distributes the weight on wide shoulder padding and a thick belt, so you will barely feel your baby's weight. It was very popular among hikers back in '07 when I purchased it for my one year old, but now it's become mainstream. I loved it too, as it let use it for hours at a time!
This carrier has a high weight limit, so it can be used with toddlers too. With baby #2 on the way I bought the new "infant insert 2" for newborns to 4-6 months, so I can get more use out of it.
http://www.ergobabycarrier.com/
On this site, they write "While wearing babies in the vertical front carry position, ERGObaby advocates facing the baby inward, towards the parent. Dr. Evelin Kirkilionis describes it best in her book 'A Baby Wants To Be Carried':
'Infants in outward-facing orientations can’t turn away from surrounding stimuli...that become overwhelming. In this position the baby cannot make eye contact with his or her parent to evaluate facial expressions, social cues, and so forth to make assessment of the situation. Only choose a baby carrier that allows your child to face you...never out.' "