I think the not worth it thing was about crossfire. I concur it is a tech to avoid(like sli). Is this the sapphire card you were talking about?
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102969&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&AID=10446076&PID=3938566&SID=
I see no reason to pay more for another card around or under 100 bucks. It will crossfire, but doesn't have the connector(cards talk over pcie bus).
Edit: darn! beat to it again. Didn't know if you need low profile or if you budget was much over 100. Otherwise would have suggested that low pofile card as well.