just go play with them...
a lot of people here will say go for the canon, another big group will say go for the nikon, and same with the pentax. just go to the store and see which you like best, because they all have the ability to produce really good results, and the minor differences from brand to brand won't matter
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Canon 50D | EF 28-135mm IS | EF-S 10-22mm | Canon Rebel 2000 SLR (film) | Canon SD1100 IS P&S
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