Try one of these: http://www.blackberryforums.com/gene...ghlight=seidio
They also have headsets and stuff.
Jabra also makes some headsets that work. I beleive they just have to have the 4 seperate parts on the plug that goes into your phone. If you look at a picture of the seidio adapters they have 3 small black rings around the plug seperating the different connection points.
I just ordered a pair of Jabra C220s off of Ebay today. I was having trouble deciding between those and the C120s. I hope I like em' and I hope this helps.