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Lots of good advice here. My advice is, unless you can shell out the $1000 for the Canon 17-55/2.8IS, you're going to need flash for consistent good results.
Direct flash looks terrible (but still better than ISO 1600 f/1.4). Bounce flash can look very natural and let you use reasonable ISO's and apertures.
Get a 430EX.
Lots of good advice here. My advice is, unless you can shell out the $1000 for the Canon 17-55/2.8IS, you're going to need flash for consistent good results.
Direct flash looks terrible (but still better than ISO 1600 f/1.4). Bounce flash can look very natural and let you use reasonable ISO's and apertures.
Get a 430EX.