Wow. First off NO computer will "last a lifetime." Your link to the CPU is broken so I have no clue as to what it is other than an AMD . Why Tiger direct? Newegg is usually cheaper. (and as I look, they have the exact same price as tiger direct on your Mobo lol).
I'm having a really tough time finding info on your Video card. The only google hits I find are for Turkish sites........ You said 5500 GTX right? Is this a 6 or 7 year old GPU with 256mb's of RAM? Did you mean Geforce FX 5500 If so, I would seriously suggest an upgrade. This was a bad card when it was released around 2002 and cost nVidia a ton of market share. The onboard video that is on the MoBo you linked would be better. Two outputs is not uncommon and I found atn least 11 cards at Newegg between $50-$75.
Don't scrimp on your power supply. No you don't need 10,000 watts of screaming power, but neither do you want something like
this. I don't know what your total budget is, so it's hard to suggest something, but
here is a good 400 watt one.
There is nothing wrong per say with the RAM you spec'ed, it's just that you can get the 4GB's cheaper by getting paired sets (2X2GB) rather than getting each 2GB stick separately. Browse
here and you will see several on the first page (and there are 10 pages of choices lol) that are less than the $60 that 2 of the ones you spec'ed would be. Use the savings on the PSU or a better GPU.
You haven't mentioned a HDD or optical drives. Both are necessary. I've had good luck with Lite on and LG. You can pick from many
here from around $20.00 and up.
For your Hard drive? Most people feel Western Digital is one of the most reliable brands, mixed opinions about Seagate, Hitachi, and Samsung, with IBM and Maxtor at the bottom, but this is largely situational. I would suggest at least 500 GB's.
What OS are you going to use?