could i hook up the hdmi from my future rig to my 73 inch t.v. and play? or is that just a really stupid question O_o?
yup, your graphics card should have an hdmi slot or a dvi to hdmi converter should do the trick.
Yes will carry sound and audio (might need to set the sounds output to the hdmid/video card) make sure you have the lastest video card drivers
Thats what I have been doing for the last 5 or so years, so yea...
You might get some overscan, which can be sorted via your drivers, and may need to set your TV to a special PC mode to stop it scaling and otherwise post processing the image but other than that there should be no issues.