amehta wrote:
If you find that the T3i is getting in the way, the 70D would be a good next step, skipping the T5i. This has excellent AF tracking to keep up with moving subjects. But if you haven't used the best possible technique with the T3i, the results won't be much better with the 70D, especially for action shots. But if you can get the full potential of the equipment, the dancers will love your photos. :-)
You didn't mention your budget if you decide to go this route, you may want to consider a refurbished 70D. Canon does the refurbishment & they do an EXCELLENT job (basically a total rebuild from the ground up with all the QC checks). Amazon has about 8 in stock at varying prices starting at $1029:
Go with a seller that has a good rating (5 stars) like the first one listed.