Please confirm my first build

[quote1. Is there anywhere where I can save money, or get better value for the same amount of money, while sticking with Intel and NVIDIA?[/quote]
Yes. Best save is get parts that fir together. 46700 do NOT fit to Z-77 Motherboard.

2. Is 750W too much / too little for the PSU? I want to have power to spare so it runs efficiently, and can accommodate SLI down the line, but I don't want my energy bill to look like I am running a generator.

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450w is enough for build like that. If you want to SLI then best is do it now. Not in future. Then you need goos 750-850w PSU.

3. Would I want SLI down the line? If so, how long will the build suffice as is?

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Tes. But then take two GTX 760 or 770.. Two GTX 760 is faster or as fast as the 780 and cheaper.

4. Is the dedicated CPU heatsink necessary? If so, do I need different RAM sticks? I read here that some memory might not fit because the NH-D14 is huge but looking at the motherboard I don't see it being an issue.

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Yes if want to OC or like silent build. RAM are fine with good cpu cooler. Better choice is this cooler:
http://pcpartpicker.com/part/noctua-cpu-cooler-nhu14s

5. Looking at solid state drives, they seem to be 2.5". Do they all come with mounts for 3.5" bays?

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Most case do have 2.5" drive space in 3.5" drive bay. Or if your do not have then you can find fitting like this.
http://www.youtube.com/watch?v=gqYWFiKudD0
With this you can fit two 2.5" drive to one 3.5" place.


Wait 10min and I post better build for you.

Now this is build is much faster and better.. You can save , get only one video card. Maybe smalles SSD.
And then if you do not need SLI then you can drop PSU to 450-550w.
PCPartPicker part list: http://pcpartpicker.com/p/1xif5
Price breakdown by merchant: http://pcpartpicker.com/p/1xif5/by_merchant/
Benchmarks: http://pcpartpicker.com/p/1xif5/benchmarks/

CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor ($219.99 @ Newegg)
CPU Cooler: Noctua NH-U14S 55.0 CFM CPU Cooler ($59.99 @ NCIX US)
Motherboard: Gigabyte GA-Z87X-UD3H ATX LGA1150 Motherboard ($159.99 @ Newegg)
Memory: Crucial Ballistix Sport 8GB (2 x 4GB) DDR3-1600 Memory ($59.99 @ Newegg)
Storage: Sandisk Ultra Plus 256GB 2.5" Solid State Disk ($164.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.98 @ Outlet PC)
Video Card: Asus GeForce GTX 760 2GB Video Card (2-Way SLI) ($259.99 @ Amazon)
Video Card: Asus GeForce GTX 760 2GB Video Card (2-Way SLI) ($259.99 @ Amazon)
Case: Fractal Design Define R4 w/Window (Black Pearl) ATX Mid Tower Case ($79.99 @ Newegg)
Power Supply: SeaSonic M12II 850W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($82.00 @ Newegg)
Optical Drive: LG GH24NS95 DVD/CD Writer ($15.99 @ Microcenter)
Total: $1387.89
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-08-28 15:00 EDT-0400)
Here is 1000 $ build.
PCPartPicker part list: http://pcpartpicker.com/p/1xirR

Hope you get good build.