Need help with computer for school

I need a computer with these specs. I would like to get an ultrabook.
Minimum Hardware Specificationslatform: Laptop or Notebook. Tablet PCs are discouraged for school work. Our faculty has found them to not be rugged enough for the rigors of backpacks and school activities.
Intel Core i5 processor or equivalent
6 Gb RAM
250 GB Hard drive or larger
Video screen with resolution of 1600 x 900 is encouraged (higher resolution, 1920 x 1080 strongly encouraged, especially for those who think they may make extensive of CAD software)
DirectX Compatible Video Card with 512 Mb RAM (1 Gb RAM encouraged for longer usability in graphics intensive fields such as computer science)
IEEE 802.11g wireless capability (802.11n is encouraged)
Ethernet (network) card