the main difference is the new intel sandy bridge processor version of the i5. You'll get the new thunderbolt (mini display port) connector as well, twice the speed of USB3 and 10x the speed of USB2. Although there are no devices yet to take advantage of these speeds, I reckon Hard Disk companies will jump on the bandwagon very soon indeed, the new connection is dual bandwidth also, meaning you can stream 1080p full HD video and data at the same time.
I would say go with the new one. Rumours are that the new models are 50% faster than last years models, the base 13" i5 is 50% quicker in performance than last years "top end" 13" macbook pro.
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