Glass before bodies, since by the time you'll have learned enough to need the features in the higher-tiered body, chances are good you'll be upgrading anyways because of sensor improvements. Although, I'm not sure why you'd be choosing between a 30D and a 50D. If you can afford a 50D, I'd say you might also want to look at the 40D or the T1i/500D, as they'd be much better feature-wise than the 30D.
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