B75 is enough for this U, and it is certainly good if you want to match SSD for H77. There is nothing wrong with using Z77 directly.

1600 the memory of dual-pass graphics card should be changed to at least 6850, such as MSI R6850Hawk 999, and 560ti if possible.

As for the power supply, it is recommended to choose a rich point with a rating of about 450W W, which is harmless in the long run.

In addition, the CPU can be replaced by E3 1230 V2 motherboard and GA-Z77-DS3H/GA-H77-DS3H.

Finally, it is recommended that CPU be equipped with radiator and 64G SSD.