2 differant cards on asus a8n mobo..PLEASE HELP!!!!!!!!!!!!!

First off I dont need asshole answer's I am here for help not smart ass remark's. Now I have a asus a8n premium MOBO I also have a 2006 ati aiw catalist and a asus 7900gt-top GPU. I do know under sli mode that both have to be identical but How do I run TV/cable off the ATI and use the 7900 for gameing and dvd's. This MOBO says it is dual card compatible but come to find out It is ONLY SLI dual card compatable.The device manager reccognizes both VGA drivers but how can you switch between the 2.I am running XP -not WMCE The rest of the system includes a AMD4800cpu a plexor atapi dvd/cd =/-R/RW and also a sony dvd/cd I have a mitsumu 7 in 1 A drive and a 120 gig ultra ata HD. I have a thermaltake 680watt PSU and the sytem is liquid cooled by a TT rythm. The sound is through a audigyzs2 platinum card. I wanted to go this route because I tryed to stay from WMCE because of all the problems so I went with ATI aiw catalist and planned to use the remote. The ati aiw should run TV/Cable/Movies and wanted the punch of the asus 7900gt-top for gameing only. I was sold on the asus a8n platinum MOBO because of its dual graphics X16 slots but come to find out it will ONLY work in sli Not individually. Is there a cure for this delimma? I have been told I have no reason to run 2 ATI aiw catalist's SLI mode(that would be retarded) but I cant run 2 7900gt's without the loss of the remote and the input of signal from outside devices. which would leave me to my only option of WMCE. How if possible can I switch between the 2. Also is it just me or how could asus let something so simple not be possible. Without this option its like a bentley without leather......lol