How bright and what features?
Assuming you want eTTL, you have 2 canon choices- the 430 and 580. Not cheap, but good solid units.
Metz makes flashes, a tad cheaper and very good, but confusing to figure out what you need at times as they make of lot of units for a lot of cameras.
Sigma is probably what you want. They recenlty updated what they offer and I'm not as up on them as I once was. The prvious models were EF500ST and EF500DG Super. The Super is what you want - it's not much more money but you get a lot more features and versatility. (I have a used one for sale...make me an offer...sorry for the commercial). It's afine flash, but not as solidly built as a canon unit - but they all break if you drop them.
The least costly in money is some used flash off ebay - vivitar 285 for example, can be had for under $100. However, some have 'trigger voltages' so high that they might fry your camera, and none of them are eTTL- meaning YOU have to figure out what the proper exposure is on the camera based on how far you are from teh subject, and how bright the subject is (white vs black, brown or blue will be inbetween, etc).
There are other flashes out there - Ritz, Sunpak and others. Every one I've seen is weak in power, low in features and just not worth the effort. Remember, you can always turn down teh power if you've go too much, but you can't do anything if you don't have enough.
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