Didn't want to shave off any more than that, this build is still very close to what you had before, but for much less. I opted for a cheaper MOBO, no need for a Z97 chipset if you're not overclocking. Dropped the CPU down just a tad, no need for overclocking. The R9 270 can typically overclock very well, and reach 270x levels, so saved some money there as well. Everything else is just cheaper versions of what you already had essentially.
Sorry for overlooking the USB compatibility, fixed that. A BIOS update shouldn't be necessary, as long as you're buying new, the boards should be shipping with the compatible BIOS by now. Haswell refresh has been out for some time now.