i would put the dash on before XBMC. or just use XBMC as your main dash. found on xbins (link in my sig)
i use evox. a very basic, user friendly. it does what a dash should do. if i want a media player i launch XBMC as an app. if i want to rip games i launch DVD2xbox as an app. anything that i use is launched from evox as an app.