I dont know if it's "the best" but I love my SmallHD DP1 monitor. Out of all monitors I've experienced, SmallHD's monitor was the easiest to pull accurate focus.
Do you get a full sized image preview when using the t2i? If you have any pics of it working with your camera, would you care to share them? I didn't see any hdmi connection on this?
Sadly, the T2i will be feeding your monitor an SD signal, so the extra money spent on an HD monitor like the DP1 could go to waste unless you're also using the monitor with other cams...
If you are looking for a good cheap monitor, you could look at getting a haier from target. (retails for around $130...on sale for around $90 at times)
They have the 7" and the 9". Both have the red/green/blue plugs on the side and it will provide a display for live shooting. They are also tvs that pick up HD channels, so the picture quality is better than your average portable monitor.
Maximum Resolution: 1366 x 768 Vertical Resolution: 720p
Maybe not as crystal clear as something 4 times the price, but still a decent value if you are looking for a cheap monitor. Comes with a wall plug, car plug, and rechargable battery...