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Rob
You really should have both a higher wattage and a hopefully a good quality power supply, most gamers would not go for less than a quality 600 watt unit, that leaves you room to upgrade to better graphics cards whereas a 450 watt is near the minimum for mid level card such as the Geforce GTX 650 - nVidia recommends a minimum 400 watt PSU for the plain Geforce GTX 650. The Corsair PSU's they list would be the wiser choice.
SATA 6GB/s is pretty much needed for a Solid State Drive, if you ever decide you'll want one of those and most people do, then you'll limit it's performance by using it on a SATA 3GB/s motherboard. Another advantage would be that the chipset on a board that supports SATA 6GB/s would also be newer and probably a little better all around. An H61 chipset is OK but was originally designed for the older Sandy Bridge processors, but an H77 chipset is newer and better suited for an Ivy Bridge processor; the Asus P8H77-M would be the preferred choice.
SATA 6GB/s is pretty much needed for a Solid State Drive, if you ever decide you'll want one of those and most people do, then you'll limit it's performance by using it on a SATA 3GB/s motherboard. Another advantage would be that the chipset on a board that supports SATA 6GB/s would also be newer and probably a little better all around. An H61 chipset is OK but was originally designed for the older Sandy Bridge processors, but an H77 chipset is newer and better suited for an Ivy Bridge processor; the Asus P8H77-M would be the preferred choice.