I also have a t2i, I use the h4n with it, and mount it on my hot shoe then run the xlrs off the back. I also have the magic lantern firmware hack.
So I run my audio out of the h4n, into my t2i mic jack, and with magic lantern I can turn off the auto gain, and monitor all my sound through the USB port on the t2i. I still record with the h4n, but I find running a direct feed into the t2i helps when I use plural eyes to sync in post.
I find this setup to be very light and versatile.