I got my SLC3 during the Christmas sale last year for $1475 with bars shipped. Weighs 16lbs with pedals, cages, mounts, and sensors.
Winspace SLC3 Superlight Black Small 48cm
Winspace Zero SL Bars 85 x 380
EXS Airtape 30g
K-EDGE Pro Chain Catcher
Your post reminds me of the saying "First world problems!".
I would say I very much doubt an amateur weekend warrior (no offense) is able to tell the difference between these bikes when it gets to a certain price point/weight/spec combination. You seem to be in the falling in the trap of trying to keep up with the Joneses, falling for the marketing brand hype and peer group pressure.
Again, its your money and do what you want but I would listen to the other posters, and either 1) improve your fitness and/or 2) improve your aero position on the bike. Both will give you better gains for much less $$$
