Specialized Roubaix SL3/SL4 vs Regular

Hi guys,
im confused about how specialized have all these different frame types. Is the SL3/SL4 (SL version) different from the regular roubaix? There is a roubaix in my LBS that i am eyeing for, LBS says its not SL3.. not even SL2 but a "regular" roubaix. If this is the case then does a roubaix have 3 types of frames? regular, SL, S-works? am i getting this right?
Thanks
im confused about how specialized have all these different frame types. Is the SL3/SL4 (SL version) different from the regular roubaix? There is a roubaix in my LBS that i am eyeing for, LBS says its not SL3.. not even SL2 but a "regular" roubaix. If this is the case then does a roubaix have 3 types of frames? regular, SL, S-works? am i getting this right?
Thanks
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Posts
For 2013, replace sl3 and s-works sl3 with sl4 and s-works sl4, same principle differences plus sl4 s-works will have the new suspension seatpost. Cobl gobl-r! Sl3/4 will have routing for both mechanical and electrical groups. Sl3 have somewhat suspect internal routing. Sometimes it just doesn't work.
Nobody I know has gotten their hands on an sl4 yet.
SL2 was for 2010 , SL3 was introduced in 2011 with a few changes but still SL3 in 2012 and SL4 for 2013
11r is lighter etc etc ...
e.g. A £1600 Roubaix plus a Decent set of Mid Range Mavics plus a couple of component upgrades (or not, 105 works!?) will cost about £2000 to £2500 depending on what you upgrade and the biggest difference for the extra £3-4000 is you. It's not like a car where more money buys you a bigger engine!
interesting take and open to debate but from pure economics and unless you have £5k to burn .....i would buy the £1200 Roubaix comp....upgrade over time if you really get the urge.
i would not get too hung up about the level of carbon, if you have decided on the bike and unless you have money to burn go for the cheaper 8r , and spend the extra on a decent wheelset...