Get the SL3, its less expensive. Then you can spend your saved money on accessories or, let's say, some nice carbon wheels. They stopped making the SL3 because it was so similar to the SL4, that the SL3 was cannibalizing sales of the SL4; despite the marketing "nothing lighter, stiffer" they try to sell you on. Money talks. Note that they still make the SL2 as an entry level option.