Messaging App that let's you customize different contact notifications?

view story

http://forums.androidcentral.com – I was using Go SMS Pro for a while and love that fact that you can customize everything..but it is SO buggy. I have a lot of group texts and the app stalls, lags and won't respond when multiple texts are coming in at the same time. It is really glitchy. Is there another app that you recommend that will support group texts and also allow you to set custom sms tones/notification for each contact? (HowTos)