Opinions on new build (ASRock MB and Intel i5)

are you using this for gaming?

if so then you do not need more than 2 x4 gig of RAM

if not then
use the graphics on the processor

Multi-purpose, but mostly for games, yes.

What kind of budget are you looking at?

That's way too much mobo for that cpu. I'd look for something in the $80 range.

$500-600, expecting to reuse the HD, power supply, and GPU.

Good to know. Any recommendations?

Asrock z75 pro3 is $85 at newegg - only real difference is its really just for a single gpu and doesn't support an ssd as a cache drive.

Here is what I would do. Don't spend $99 on the case. The Corsair 300R is a great case for less. Your video card is extremely outdated. (http://www.videocardbenchmark.net/gpu.php?gpu=Radeon+HD+4850). If you can go to $615 before rebates, you should get a new PSU. Ultra is not the most reliable PSU (sorry to say, made in USA). The 620W is suggested is a bit much but for $29 after rebate, it is a steal.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-3350P 3.1GHz Quad-Core Processor ($179.99 @ Newegg)
Motherboard: MSI B75MA-E33 Micro ATX LGA1155 Motherboard ($59.99 @ Amazon)
Memory: Patriot Viper 3 8GB (2 x 4GB) DDR3-1600 Memory ($38.50 @ NCIX US)
Video Card: HIS Radeon HD 7870 2GB Video Card ($199.99 @ Newegg)
Case: Corsair 300R ATX Mid Tower Case ($67.41 @ Mac Connection)
Power Supply: Antec Neo Eco 620W 80 PLUS Certified ATX12V / EPS12V Power Supply ($29.99 @ Newegg)
Total: $575.87
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-01-26 23:53 EST-0500)

and if you replace the i5 and the b75 motherboard with

AMD FX 6300
Asrock 970 extreme3 motherboard

you get the exact same game performance and save $30

or even mATX on the motherboad.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD FX-6300 3.5GHz 6-Core Processor ($133.79 @ Amazon)
Motherboard: ASRock 880GM-LE FX Micro ATX AM3+ Motherboard ($59.99 @ Amazon)
Memory: Patriot Viper 3 8GB (2 x 4GB) DDR3-1600 Memory ($38.50 @ NCIX US)
Video Card: HIS Radeon HD 7870 2GB Video Card ($199.99 @ Newegg)
Case: Corsair 300R ATX Mid Tower Case ($67.41 @ Mac Connection)
Power Supply: Antec Neo Eco 620W 80 PLUS Certified ATX12V / EPS12V Power Supply ($29.99 @ Newegg)
Total: $529.67
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-01-27 01:35 EST-0500)

Thank you so much!

I'll look at these suggestions in depth tomorrow. Unfortunately, the case is a done deal -- the only part already purchased, as it was perfect size and layout for where it was being located.

What about this? I found a spare MB...

ASUS P5N-E SLI LGA 775 NVIDIA nForce 650i SLI ATX Intel Motherboard

If I use that, could I build a system that's comparable with what I posted originally in terms of a gaming rig? I'm not sure if the CPUs currently available would give me a good enough system. But it would drop off the MB price in my overall cost.

So this is my updated system, based on some suggestions here. While the GPU may be outdated, I may replace it with a better one in the future, though I will never be using more than one card.
-=-=-=-=-=-=-=-
CASE: AZZA Silentium 920B Black ATX Mid Tower Computer Case (already bought)

MOTHERBOARD: ASRock Z75 Pro3 LGA 1155 Intel Z75 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard

CPU: Intel Core i5-3350P Ivy Bridge 3.1GHz (3.3GHz Turbo) LGA 1155 69W Quad-Core Desktop Processor BX80637i53350P

GPU: XFX HD-485X-YDFC Radeon HD 4850 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready Video Card (from previous system)

POWER SUPPLY: Ultra ULT-VX500 500W ATX12V (from previous system)

RAM: Crucial 8GB Kit (4GBx2), Ballistix 240-pin DIMM, DDR3 PC3-12800 memory module BLT2K4G3D1608ET3LX0

HDD: 500GB (from previous system)
-=-=-=-=-=-=-=-

Does this make more sense?