Can some one recomend source switching device

i'm doing AUX mod on my IS300 and this will go in between stock head unit and stock amp. i will still be able to controle sound of the head unit as this is done via separate line to amp.

i need to be able to switch between 3 or 4 different units ie: Stock Head Unit, XM radio, iPod and maybe DVD. basically its a 3x1 or 4x1 audio ( red and white RCA) switch that can be manual like the one below or electric relay with a switch aslong as it is small

i was thinking of something like this:
http://www.crutchfield.com/S-fUfhhji...40S#morephotos
but its a bit to big.

is there smaller unit? i dont really need video part so if there is unit which can do just audio that be fine.

thanks for your help.