Never dealt with the company so can't help you there. Its a very powerful computer, pretty much top of the range. Whatever you buy now will be replaced with something faster in a few months so its up to you regading this.
All the parts I can see are good with one exception I don't like the power supply, I personally would prefer a bit more something like a 500 watt branded power supply for a high end system like this, especially as you might add more bits on later. Don't know about the motherboard but I have an ASUS AMD motherboard and ASUS boards are very good in general.
Can't help with the processor either as I know more about AMD ones but Dual Core Duo 2 seems to be highly regarded and extremely fast.
I would recommend getting a copy of Acronis for backup and a large external hard drive as well for backups.
In short the spec of that PC should do you for years to come.