Re: What is SSD Caching and "Intel Smart Response" ?
z68 is a better chipset overall, and the Smart Response is more or less a way for people to not feel bad because they could only afford a 20GB SSD. You're better off in the long haul getting as much SSD as you can afford, and just not worry about it in general.
The p67 is a fine chipset, and your motherboard is a good investment. z68 is just a little bit newer, and yes, benchmarks a little faster, but the margin isn't enough for you to throw everything out and switch. The nice thing is, when you're ready to upgrade again, everything that was in z68, should be in the next generation as a default anyway.