G'day Alders,
I'd like to know what king of gaming/graphics work you will be doing with the PC, as well as budget.
If you're into gaming, or hardware intensive work, I may be able to help.
With reguards to the rig you linked to, there's not much info about the parts, and I'd be tempted to ask them to swap in a bigger Graphics card and a bigger power supply.
If you can get a new Radeon 5770 you'd be much better off for gaming, better performance, DirectX 11 support, that sort of thing. I'm not sure about over in NZ, but across the ditch in Aus the 5770's are usually priced around $20 more than the GTS 250s, and have a damn good performance advantage over them. Well w orth it if you ask me.
With reguards to the rest of that PC, the CPU looks perfect, the Core i5 750 is one of the better ones in the new range, and will easily handle most of the stuff you can throw at it. Coupled with 4 Gig of DDR3 RAM, that thing would fly.
The 1 TB hard drive looks good, 64MB cache and 7200 RPM means it'll be a fast little sucker. The only other thing I can tell you about it, is the CM-690 II case is a pretty damn nice one.
As I said, I'd probably go with a bigger PSU and 5770 graphics card, the rest however looks fine.
...I am certainly impressed with the advice
on the sevenforums and am enjoying reading all the tutorials and advice.
If you wanna see a few awesome machines, have a read through the
http://www.sevenforums.com/hardware-devices/347-show-us-your-rig.html thread
There are some awesome set ups in there, and may help you decide on what you want.