If you're looking for a front carrier that crosses in the back, many people recommend the Sutemi. http://sutemigear.com/ The only thing is when you switch to a back carry, the straps will be crossed in the front, too.
The Ergo is mostly liked for the back carry. It works for a front carry, but it's not the most comfortable.
Also consider the following:
Portacara, Jackpack, Loveseat buckle mei tai and Tentoes Click.
FWIUS, Angelpack will be coming out with a buckle mei tai as well.
The Portacara can cross in the back and the others can be custom made to suit your needs.