Between those two sizes, I'd go with the 215/45's, although acceleration might be a tad slower than with the 205/40's.
205/40 is pretty small, though, and would be more than 3% off from stock (assuming 02-03's 195/60-15 wheels as stock).
I've got 205-width tires on my 7" wheels, and they seem fine. So, with a bit of extra width on yours, 215 should work well.
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