My New Build - Need suggestions

In theory, those parts should yield a decent build. Unfortunately, they won't. First of all, that motherboard does not support 125W CPUs. From the ECS web site at http://www.ecs.com.tw/ECSWebSite/P [...] =1&LanID=0 : "This board supports CPU up to 95W TDP only; you can refer to AMD website to check your CPU."
I also have some serious quality concerns.
It's an old list, but the PSU quality tier listing at http://www.tomswiki.com/page/Tiere [...] ngs?t=anon puts NZXT on tier-5 ("Do not buy" ). From reading competent PSU reviews on sites like jonnyguru and hardocp, that suggests to me that NZXT is probably severely overrated, does not have stable rails, which may be particularly erratic as the PSU is stressed, and is very capable of taking other components with it when it dies, or of shortening their useful life. Also for quality reasons, Diamond is on my personal "Do not buy" list, over a plethora of problems associated with one of their HD3870 cards, but not limited to that card. Their tech support was non-existent (e.g. unreachable) or it was lame; ATI installers would not recognize their product and install, nor would a number of 3rd party utilities work properly with it, after multiple multi-hour sessions. There are too many working offerings out there for me to have any excuse to ever buy a Diamond.
Finally, I would highly recommend getting DDR2 RAM that will operate at its advertised timings on the JEDEC standard 1.8V. Otherwise, what you'll get is factory overclocked, and will have worse timings or be unstable at that standard voltage; essentially inferior RAM (IMHO).
It was a nice first shot at a build list. I'm sure your revisions will be better.

For more specific suggestions, here are some links. I know you cannot shop at Newegg so I'm not including prices; I'm only offering them for reference, but I don't think they're budget-killers.

Mobo: GIGABYTE GA-MA790GP-DS4H AM2+/AM2 AMD 790GX HDMI ATX AMD Motherboard : http://www.newegg.com/Product/Prod [...] 6813128352
Supports 140W CPUs, including Phenoms if you ever decide you want one. Very feature rich, but I think a better choice than a 780G offering. I just bought one, and initial setup was a breeze. As a non-hardcore gamer, you may even find the integrated graphics quite competent. Guild Wars runs at 40-50 FPS at 14x9 with most eye candy on.

PSU: Antec earthwatts EA500 500W ATX12V v2.0 SLI Certified CrossFire Ready 80 PLUS Certified Active PFC Power Supply : http://www.newegg.com/Product/Prod [...] 817371007.
Quiet, capable, and efficient. You may find one of the Earthwatts models (380W, 430W, 500W, or 650W) has a good deal somewhere.

RAM: mushkin 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory: http://www.newegg.com/Product/Prod [...] 6820146118
Runs on the JEDEC standard 1.8V with decent timings.

GPU: If you want a good GPU, based on your single remark about your gaming (which may really not be enough!), you may find an HD3850 or HD4670 sufficient. Otherwise a more powerful HD4850 should be all the power you need. An nVidia equivalent would be a 9600GT at the low end, up to an 8800GT. Any of those would run on a quality 500W PSU. The HD4670 or 9600GT would run on a good 380W PSU like the Earthwatts.

You won't be spending so much on the GPU, so any other changes should fit within your budget. If it is still a little tight, although the Antec 900 is a nice choice, consider an Antec 300 or a CoolerMaster RC690. I own the latter, and it is a really nice case with outstanding cooling. I believe it is superior to the Antec 300 if your PSU has a 140mm fan that can draw its own air from beneath the case.

The mobo I linked has the latest overclocking features for AMD. I'd like to mess around with them some, but I built that rig for my wife and we just want it to work without any hassles. We'll see; maybe I'll build myself another one. The CPU you chose is fine on that board.
Look at the RAM specs for the voltage requirement. Anything over 1.8V means it's a factory overclock.

Yeah Newegg just started supplying Canada as well so im sure plent of people are going to be SUPER HAPPY.

The Gigabyte mobo I linked can do Crossfire at x8,x8.

There are two PCI Express slots on that mobo. If ONE video card is installed in the first slot, it runs at x16 speed. If a SECOND video card is added, in the second PCI Express slot, that one runs at x8 speed, and the first one will also drop back to x8 speed.
Someone who has messed around with Crossfire a lot may be able to tell you, or post links to benchmarks showing if that drop back to x8 will make much difference. For the imaginable future, I will not need Crossfire myself.