Perhaps I should've been more specific, your best bet is to get a Dual Link D (digital) DVI to HDMI.
Adapter, DVI male to female HDMI
Cable, DVI male to male HDMI
Ether way as long as the DVI is Dual Link it will support resolutions up to 2560 x 1600 (dependent on your HDTV's max res.) and aslong as the DVI is digital it will support audio too.