Hi Chrisvanderhoof,
The Speedlite 270EX II, Speedlite 320 EX, Speedlite 430EX II and Speedlite 600EX-RT are all good choices when coupled with your Speedlite Transmitter-equipped EOS Rebel T3i.
It's really not possible to tell you which of these flash units is best without knowing something of how you shoot.
For simple shots the The Speedlite 270EX II may suffice nicely where as you may want the The Speedlite 600EX-RT for more advanced setups.
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