DVI and HDMI, as far as video goes, should be the same quality (they are actually the exact same signals, just a different connector). DVI does not support audio (just video), so you will need separate audio cables (either AV cables like you were mentioning, or optical out).
Because the connector is different, you will need to get a DVI to HDMI adapter.
Hey ppl, I love the apple macbooks, and learnt that they support only DVI whereas the pc laptops support HDMI video output. Is having HDMI give higher quality picture when outputted to a tv or are the two formats (if that is the correct word, i`m not technical but i love learning about technology) pretty much the same. Also, someone told me that i need a DVI-to-HDMI adapter in order for sound to be outputted to the tv, but i thought that was what the av cables were for (the red, white and yellow), i ma not know what i am talking about, so please ppl help!! Thx,