Which MSCA/MSCE exam should I take first?

Hey all. I currently have my A+ certification. I am working on Network+ right now. When I complete that, I will look towards getting my MCP. I may just stop at the MCP, or I may go furthur to MSCA/MSCE. So in case I stop at MCP, what would be the most beneficial topic to learn? I am guessing Microsoft Windows 2003 Server (290). I already know Windows XP pretty damn well. Thanks guys.
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Second that, great suggestion.
I didn't take 210, but there was alot of overlap with 270. Alot with permissions & AD.