Re: New PC advice
You are getting some bad deals, and it would be suitable for modern gaming on low-medium settings, not medium-high.
Core i5 6xx processors are dual; core processors, you will want a 7xx instead, or, go for an AMD 955, it will give better performance at a lower price
Hard drive, I would stay away from Hitatchi. They have come a long way in the last few years, but so far as performance and reliability (especially reliability) is concerned, they are still below the standards of WD/Samsung/Seagate
Motherboard, I would take an Asus, Gigabyte or ASRock board over Intel. Intel do make decent boards, but they aren't as good as the ones listed.
Graphics card, GTS250 is showing its age a bit now. It will deffinately still handle anything you throw at it, and will do for a while to come, at medium to high for any amount of time though, no. Going for a GTX 260/HD5770 instead would be a better option at not a whole lot more.
Finally, what power supply will you be using?
Primary::: Asus M4A79XTD EVO | AMD Phenom II x3 720BE @ 3.4GHz | 2 x 2GB Corsair 1600MHz | XFX HD5770 + eVGA GTX260 Physx | 500GB Samsung F3 + 520GB Storage | Corsair Obsidian 700D | Win 7 Ultimate x64
Secondary::: Asus P5N32-E SLI Plus | Intel Q6600 | 2 x 1GB Corsair 800MHz | Gigabyte 9800GT | 180GB Caviar Blue + 250GB Storage | Win 7 Ultimate x64