General

If you are on a tight budget, a quality 450w. If you aren't, then it depends on you. A 550w will give you more of a leeway for a more higher power consuming component in the future, and you aren't really buying an excessively large power supply (there are people who would go about getting a 750w+ for that system).

The only thing about giving more for future upgrades is that tech tend to be more power efficient as time goes by. For example, an upgrade to the HD 7950 is in the same wattage range as the 6870. The better performing 7850 for $270 is even more power efficient. So if anything, you will be more limited by whether or not you are able to SLI/CFX in future (provided that your mobo choice allows you to do so) which may not matter as you could easily sell your 6870 in 2-3 years and get a single more powerful card.

[quote=qwan456]I can't say for sure if it going to be as good as the one I had showed you, as I haven't actually seen their CM job when they are going to shipped to their customers other than the videos Linus posted on Youtube on their showcase PC (which are very good, but it is to be expected if they are showcasing their PC).

Base on the reviews I had read and two or three people I had helped with their NCIX PC build, their cable management is very well done and it look very "clean" inside.[/quote]

So for a final decision,
450w or 550w?

I can't say for sure if it going to be as good as the one I had showed you, as I haven't actually seen their CM job when they are going to shipped to their customers other than the videos Linus posted on Youtube on their showcase PC (which are very good, but it is to be expected if they are showcasing their PC).

Base on the reviews I had read and two or three people I had helped with their NCIX PC build, their cable management is very well done and it look very "clean" inside.

@qwan456:

If i get this case, with NCIX's "assembly" thing,
will they do they cable management like in the pictures?
because that looks really nice.

[quote=ultimangex]So get a 550 or a 450?
Isnt more psu = more cables?
I don't want my case stuffed with cables.[/quote]

If you get an 450w: http://ncix.com/products/?sku=63238&vpn=P1450SX2B9&manufacture=XFX&promoid=1259
There isn't anything wrong with getting a moderately larger PSU, but you have to planned it out so you don't overspend on something that you won't get back.

As for stuffing your case with cables, I recall you saying something about airflow with cable management on another thread.

Here's a image with the original Coolermaster 690 with a Corsair TX750.
http://img.photobucket.com/albums/v724/Indianaryan/IMG_1136dpp_edited-1.jpg
Here's how it look from the back:
http://img.photobucket.com/albums/v724/Indianaryan/0042.jpg

Unless you had changed it again, you are also getting the upgraded CM 690 II, so you shouldn't have anything to worry about if the cable management is good.

[quote=TheSinsher]Future proof =)[/quote]

There is no such thing as "future proof." Power supplies have been following industry standards for a long time. Current and upcoming technology does not need those standards to change. A power supply with a greater power output than another power supply is not "future proofing", but raising the ceiling for upgrades.

As stated in the specications:

Coolermaster GX 450W

Connector M/B 20 + 4 pins x 1
CPU 4 + 4 pins x 1
PCI-e 6 pins x 1
SATA x 5
Peripheral 4 pins x 3
Floppy 4 pins x 1

------------------------------------------------------------------
XFX 550W PRO550W

Motherboard Connector: 20+4 Pin
4-Pin P4: 1
6-Pin PCI-Express Connector: 1
6-Pin/8-Pin PCI-Express Connector: 1
4-Pin Floppy Connector: 2
4-Pin Peripheral Connector: 2
SATA Power Connector: 3

[url=http://ncix.com/products/?sku=63572&vpn=RS450-ACAA&manufacture=COOLERMASTER]the 450[/url]
[url=http://ncix.com/products/?sku=59615&vpn=P1550SXXB9&manufacture=XFX]the 550[/url]

It depends. What cables are included are listed in the manufacturer specifications.

Both 80 plus
I don't think I'll upgrade any time soon.
Is the 550w a lot of more cables or like 1-3?

So get a 550 or a 450?
Isnt more psu = more cables?
I don't want my case stuffed with cables.

It's like around 300w-350w peak with stress programs. Real world will power consumption will be lower.

550W is fine for what you have. The actual output of the PSU will fluctuate somewhat depending on usage like anything else.