Tarmac SL4 or SL3?

New bike time, well I'm worth it 
LBS have offered 10% off of Tarmac Pro SL4 with SRAM RED and I've found a new 2011 SL3 Pro with Dura-ace for a little bit less. I've not used SRAM kit on any of my previous bikes so wondered which would you chose?
I guess both will be great, can I really be fussy enough to go on colour of frame i.e. matt black or gloss white? :oops:
Thoughts appreciated

LBS have offered 10% off of Tarmac Pro SL4 with SRAM RED and I've found a new 2011 SL3 Pro with Dura-ace for a little bit less. I've not used SRAM kit on any of my previous bikes so wondered which would you chose?
I guess both will be great, can I really be fussy enough to go on colour of frame i.e. matt black or gloss white? :oops:
Thoughts appreciated
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you're not fast enough to appreciate the difference in stiffness, but unless you are colour blind, you will always regret buying the ugly one
On smaller sizes it's the same, bigger sizes 20mm.
The sl4 SRAM red frame is oddly appealing to me but I don't care for the bits hanging off it!