http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-650ti-boost/specifications
Thermal and Power Specs:
97 C - Maximum GPU Temperature (in C)
134 W - Maximum Graphics Card Power (W)
450 W - Minimum System Power Requirement (W)4
One 6-pin - Supplementary Power Connectors
So, 450 watts for system with 1 GPU.... add 134 watts if ya wanna be ready to add a 2nd GPU in the future. Id use a TX-650 or equivalent from Seasonic M series or XFX Core Edition.
Would strongly advise against getting last gen MoBo / CPU.
http://benchmarkreviews.com/252/msi-z87-mpower-max-motherboard-review/12/
I don’t think there’s any compelling reason to move from an Ivy Bridge or even a Sandy Bridge based system to a Haswell system– there simply isn’t enough performance and feature differential to justify it. On the other hand, if you’re building a new rig from scratch, there’s little point in investing in end-of-life platforms, so going Haswell/Z87 makes sense.
Yes, IB OC's on average 6% better than HW but HW comes outta the gate 10+% faster for IB never quite catches up.