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would go with 1G (2x 512K) DDR2 533.  Is the size and speed I picked a bad
idea?  I figure in a few year I'll upgrade the memory if and when I need
more or better memory.

Is there a real difference between PC2 4200 and PC2 4300?  They are both
DDR2 533.

Where is an inexpensive and reliable store for memory?

Here is the one I'm looking at ... Because its cheapest I've found so far.
http://www.newegg.com/Product/Product.asp?Item=N82E16820161669

The rest of the DDR2 533 PC2 4200
http://www.newegg.com/Product/ProductList.asp?Category=17&N=2010170147+10524
08147+1052308476&Submit=ENE&SubCategory=147

Thanks,
Jon