Has anybody had success with 1.7 Ghz? The price difference between 1.7 and 2.0 is pretty big (about $200 from what I've found)... So it would be nice to know if the extra .3 Ghz is necessary. I guess if 1.3 can do 720p, I'd imagine 1.7 could do 1024i. But does anyone know for sure?