I have a 22" Viewsonic TFT monitor which i want to use as standalone TV (after i get a laptop and stop using my desktop). It has a DVI port. Do any of the DTH brands support a PC monitor thru DVI/VGA? Do I have to buy a external tv tuner for this purpose? I already have a internal tv tuner but the picture quality of tv(thru tv tuner) is not that good though the quality of dvd/downloaded movies is quite good. Pls give details as I'm not familiar with this.