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#51
For all practical purposes, Office applications don't care what kind of computer they run on -- as long as it runs properly. Any low-end, dual-core processor with 2~3GB of available ram will do an excellent job. This applies to internet and browsing functions, also.
Games have in the past been single-core oriented, placing demands on the graphics system, not the CPU. To a great extent, that's still true. Even Crysis, one of the most demanding games available, runs best on a very fast dual-core machine as opposed to a slower quad-core machine. Ignoring the graphics subsystem, and using a flawed analogy, gaming needs horsepower (speed), not torque (multi-core) from its CPU. In truth, for a gaming machine, you are better off looking at one of the high-end (meaning high speed) AMD dual-core CPUs than at any of the Intel chips. Then pair it with the most honkingly-powerful, turbo-charged graphics card you can afford.
Engineering (AutoDesk's heavy hitters), scientific (serious physics, atmospheric modeling, etc), video editing (Adobe Premier), image & file rendering (DVD ripping & conversion to .avi/.mkv), and file compression/decompression (WinRAR, 7-zip, etc) need torque. Speed and workspace (memory/ram) don't hurt, either, but torque is king. Here is where the i7 shines, but the i5 is no slouch here, either.
Any build is a balance of the various parts. None is perfect for every application -- even monster workstations like my own aren't perfect. Mine is a mediocre gaming machine and serious overkill for office apps and internet/browser usage.
Given that you are in high school and will probably use the machine for 3.5-to-5 years, upgrading some of its parts at about midway its life, and given that you are interested in some of the heavy applications as well as some of the more resource-hungry games, my best advice to you is to look for a higher-speed processor and worry less about cores or memory channels.
- CPU: (horsepower vs torque) go for a faster i5 (or one of the faster, new AMD CPUs) as opposed to the higher torque at the expense of speed i7-920
- RAM: (workspace) 4-or-8GB with the i5 or AMD; 3-or-6-or-12GB with the i7
- GPU: (turbocharge those games) spend what you can afford; CPU doesn't help you here
- HDD: (storage)
- OS & Apps on the fastest drive you can afford, SSD, VelociRaptor or Caviar Black, in that order. Don't bother with RAID-0, it's usually a waste unless you can similarly soup up everything else.
- Primary data storage on Caviar Black
- Secondary data storage (and/or backup) on Caviar Green
Typical system as described, 450-500 watt PSU using single-GPU AMD/ATI graphics card, add 100 watts if using a 2nd GPU. Add 50 watts per GPU if using nVidia graphics card(s).