Its not the size, its the resolution. In other words..
You wont see more tracks because you have a larger TV. You'll see more tracks because you have a larger resolution.
You want a TV with a good refresh rate and pixel density.
Im going to be honest here, im not a brain wiz when it comes to doing this. I simply know from my own experience.
I use a 42 inch Visio HDTV with Sonar. It looks amazing. I use the HDMI port. (I also have a VGA port that doesn't look to shabby either). Thing is, rather than seeing more tracks, you just see the tracks larger scale.