B75 offers "native" PCI support with Ivy/Sandy Bridge, which may be relevant if using older PCI cards. It's a "business-oriented" desktop chipset, so not intended for overclocking/gaming, although several mobo makers do offer B75 boards with overclocking support (and ridiculously, dual PCIe-16 slots). One downside of B75 is that it provides only a single SATA 6Gb/s (SATA III) port, the remaining 5 ports are only SATA 3Gb/s (SATA II), whereas other Ivy Bridge chipsets offer 2x SATA 6Gb/s ports. Also, onboard RAID support is iffy.

If you aren't going to be using a power-hungry gaming graphics card(s), then your power supply requirements will be dictated by the cpu and chipset and to a lesser extent by memory and drives. A 3770k draws less power than your Q6600 does, and B75 PCH draws less power than the old socket 775 NB/SB chipsets do, so with a moderate performance graphics card the power requirements for a B75/3770k 32GB system should actually be less than for your Q6600 4GB system, even if moderately overclocking the cpu. If using a cpu with integrated graphics, power requirements might be even less, So your Corsair PSU should still be more than adequate.

3820 requires an X79 mobo, and only makes sense if one needs more memory or graphics performance.

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