SuperHappyMan, you have to realize that Sparrow is in Malaysia and newegg is not available here.
I am not sure what PSU's you'll be able to get but like HappyMan said, get a good quality PSU. It is considered the most important component of a PC.
This is an accurate list about the brands and types of PSUs:
http://www.eggxpert.com/forums/thread/323050.aspxUnfortunately the brand of the PSU you showed is not in the list...
My PSU is an OCZ StealthXStreme 700W and has done well for almost 3 years now.
If you're going for a >700W PSU, then you definitely can/should get a good G-card. AMD HD 6800 series are good and the Nvidia GTX 560 is also a solid card (I currently own it).
What card length can your Case support? Since the cards can vary in sizes.
What resolution(s) will you be using while and off gaming? HD 6xxx are better in high resolutions than GTX 5xx series.
Do you like having great graphics (max settings) in games or are you content with decent graphics (medium-high settings)? GTX 5xx tend to run better at high graphic settings than HD 6xxx.
If you're going to make 3-D models, the Nvidia cards tend to be better than the ATI/AMD cards.
Last question, what brands can you get for both PSU and Cards? Recommended G-Card Brands (off the top of my head) are: EVGA, MSI, Sapphire, ASUS, XFX.
Cheers
Yanoda