Need help picking between the two bikes. Help :)

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I've been riding an specialized allez for a couple years and I want to upgrade. I have a chance to buy a used 15 pound 2011 s-works sl3 with less than 2000 miles on it with full sram red and krysium sl for $2300. Or do I buy a brand new specialized sl4 elite 105 for $2600+tax. Regardless of what I chose I will upgrade the frame in about a year to an sworks sl4 or sl5. Thanks for any advice.
 
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