I was thinking two of the 128GB C300 vs. four of the 80GB X25-M, with data shown on the same graphs (or in the same post), for easy A/B comparison.
You could also do two 256GB C300's vs. four 160GB X25-M's, but the cost isn't as close as the other setup, and I suspect the other one will likely perform nearly as well.
Cost for 128GB C300 (Newegg): $419 * 2 = $838
80GB X25-M: $225 * 4 = $900
256GB C300: $680 * 2 = $1360
160GB X25-M: $425 * 4 = $1700
The size differences don't bother me too much, since I would only use a 64GB partition on the X25-M 80GB drive anyway.
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