There are some issues with the builds you were planning so I'll go through the two builds and explain what I'd change and why...
Build 1
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Price breakdown by merchant
CPU: Intel Core i3-4330 3.5GHz Dual-Core Processor ($135.95 @ OutletPC)
This CPU is not suited for high-end gaming like the card you've paired it with. In a growing number of games this CPU will hold back the graphics card. I'd suggest an i5 or, if the budget cannot stretch, an FX 8320 with a CPU cooler.
Motherboard: ASRock B85M Pro4 Micro ATX LGA1150 Motherboard ($69.99 @ Newegg)
This motherboard is aimed primarily at business users. It does not have some features found on the new H97 and Z97 boards such as support for M.2, SATA express and the new Intel chips due for release next year. It's only $7 less than the Gigabyte H97 board which is a better option.
Memory: Kingston Fury White Series 8GB (2 x 4GB) DDR3-1600 Memory ($79.99 @ Amazon)
This RAM is OK but the price is higher and the latency is worse when compared to the G Skill Ripjaws RAM in my builds. There's not really any good reason to choose it over the G Skill Ripjaws stuff that's $9 cheaper
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($53.98 @ OutletPC)
This HDD is fine
A similar drive is the Western Digital Caviar Blue. Simply go for whichever is cheapest on the day of purchase!
Video Card: Asus Radeon R9 290 4GB DirectCU II Video Card ($279.86 @ Newegg)
See above comments about CPU and comments below about PSU
Case: BitFenix Shinobi Window ATX Mid Tower Case ($69.99 @ Newegg)
Case is personal preference, go with what you like!
Power Supply: Corsair CSM 450W 80+ Gold Certified Semi-Modular ATX Power Supply ($49.99 @ Newegg)
You will NEVER be able to run an R9 290 with this PSU. You need a QUALITY 600W minimum. The CS PSU's from Corsair are aimed at office use. They are not good quality. Please replace this with a decent 600w+ unit from Seasonic, EVGA (not W, G1 or B1), Antec, Rosewill Capstone or XFX
Wired Network Adapter: Belkin F4U047-RS 10/100 Mbps USB 1.0 Network Adapter ($16.54 @ Amazon)
This is a wired ethernet adapter. You will have at least one of these ports on your motherboard already. Are you wanting a WiFi adaptor?
Total: $756.29
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-10-19 16:33 EDT-0400
Build 2
PCPartPicker part list /
Price breakdown by merchant
CPU: Intel Core i3-4330 3.5GHz Dual-Core Processor ($135.95 @ OutletPC)
Same issue with CPU not matching the GPU well
Motherboard: MSI H81M-P33 Micro ATX LGA1150 Motherboard ($48.85 @ Amazon)
H81 boards are the lowest of the low in terms of features. They're great if you have a super-tight budget and can't afford a H97 board but you can! Compared to the Gigabyte H97 board in my build this one does not have PCIe 3.0 so there is a chance your very high-end graphics card may be bottelnecked by your motherboard (I actually don't know whether the new cards can now saturate the PCIe 2.0 slot yet but there's a good chance the next gen will) You also get fewer USB ports at the back (especially USB 3.0) and no front USB 3.0 ports at all. There will be no new features like M.2 and SATA express on this board and frankly, I avoid MSI if I can because I've had nothing but trouble with their boards turning up DOA.
Memory: A-Data XPG V1.0 8GB (2 x 4GB) DDR3-1600 Memory ($79.99 @ Newegg)
This is OK too but again not worth paying more than the $70 for the Ripjaws stuff
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($49.98 @ OutletPC)
Fine, see comment on other build
Video Card: Zotac GeForce GTX 970 4GB Video Card ($335.91 @ Newegg)
This is a nice card but I think you've had to make too many compromises on your other components to get it in budget
Case: Thermaltake Urban S1 MicroATX Mini Tower Case ($39.26 @ NCIX US)
This case might feel rather cramped without a modular PSU as it's mATX
Power Supply: Corsair Builder 500W 80+ Bronze Certified ATX Power Supply ($29.99 @ Newegg)
This is a poor choice of PSU for a premium GPU like the 970. Whilst it *might* be OK the CX series do not have a good reputation and are not made from top quality parts. Like the PSU in build 1 it's more suited to office systems.
Total: $719.93
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-10-19 16:46 EDT-0400