I love my 50mm prime. Not only is it great in low light, it's INCREDIBLY sharp.
If you're shooting on a crop sensor though I'd suggest the 35mm prime. I find the 50 mm a little too long some times. Of course a 35 mm will be more pricey, so I'm happy to deal with the limitations of the 50 mm.
Yeah - I think the price differential means the 50mm is a lot more logical. FWIW, I find myself using the longer end of my telephoto when taking portraits anyway, so I'd probably be happy with that focal length.
Now I gotta find a cheap SD card...or SDHC?
I am thinking 4 GB is enough. And a camera bag. ebay seems pretty cheap for those things...
Are you planning on shooting in RAW or JPEG? Highest-quality JPEGs on my camera are about 3.5MB - RAW would be about twice that. For me that means my 1GB card holds ~280 JPEGs or ~140 RAWs.
In any event, 4GB should be plenty.
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One thing to keep in mind with bags is whether you plan on acquiring more lenses later on. A small bag is handy, but can only hold one lens in many cases. OTOH, carrying a big bag with only one lens is a bit of a waste. Something to think about, though.