3 outputs on one graphics card

Hi everyone,

I currently have 2 dvi monitors and my tv plugged into my graphics card (Radeon 5770). The tv (Sony Bravia KDL-40WL140) is connected via HDMI. The graphics card I have has 2 dvi slots, one HDMI, and one display port. I realize that in order for me to get all 3 devices working at once, I need to utilize display port. Right now, I can either have both monitors working, or one monitor and my tv operating, but not all three.

I am wondering if a convertor cable would solve my problem, such as a "displayport to dvi cable", for one of my monitors.
Like this one:http://www.monoprice.com/products/product.asp?c_id=102&cp_id=10246&cs_id=1024608&p_id=6014&seq=1&format=2


Any expertise would be appreciated!

Thanks



Radeon Specs
http://www.amd.com/us/products/notebook/graphics/ati-mobility-hd-5700/Pages/hd-5770-specs.aspx

Sony Bravia Specs
http://esupport.sony.com/CA/p/model-home.pl?mdl=KDL40WL140&template_id=1&region_id=3&tab=manuals#/manualsTab

Thanks so much for your response.