After months of looking/comparing I've decided the SP4 is the one for me. I was going back and forth between the SB and the SP4, at the end of the day my wallet won. With the added 2yr warranty the SB was coming out nearly $600 more for the same specs, just an extra inch of drawing space. In addition, with or without the keyboard I have the full power and battery life of the PC in my hands. Now it's time to get creating and fully enjoying the experience.