I agree, I had an SL (sold it to DJSKA actually, lol) and actually prefer my 05 S-Works Enduro over the SL. For the weight penalty ( my SW Enduro weighs 33lbs) i feel it is very fast, and i never feel at a disadvantage when i ride with guys that are on SL's or other XC bikes.
In terms of suspension, I dont know what makes the SL light years ahead of the enduro, the suspension on boths bikes is great in my opinion, they both perform wonderful. My 05 Enduro seems much plusher, and has the "climb over anything" feeling when going up hills, just point uphill and pedal, it doesnt matter what is in the way, and it decends like a DH bike going down, the frame is super solid, and stable feeling, it really inspires confidence. The SL on the other hand is (depending on how you have the shock set) at bit more like an XC bike when climbing, pick a line and pedal up, it climbs great, but i didnt feel it had that "roll over anything" feeling the SW enduro had........people that have ridden Standard enduros know what i am talking about.
The SL too decends great, i just didnt feel it was as plush or a ride down as the Regular Enduro was.
I agree though, if you the route of the SW Enduro, i would try to get the price down a bit, possibly $2450-$2650?
Let us know what you, and honestly, you CANT make a bad choice with those two bikes, see if you can test ride either...and keep us updated........also PICS when it arrives!