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Just of the top of my head (and my general computer knowledge), you'll probably be looking more for a desktop then for a laptop. Laptops cost more than a comparable desktop, and are usually less power. Also down the line you can easily upgrade a computer to stay current, however you'd have to buy a whole new laptop if you want to upgrade.
As for intel vs amd. Intel is useful if you plan on overclocking and I heard they are faster comparable. AMD are cheaper and really good, but aren't as easily overclocked. You'd want to get a good computer with multicores (more probably the better) as most of the encoding can be optimized by all the cores. Gaming you don't need that many cores yet as many haven't been optimized for multicore machines.
Most mobo have an intergrated soundcard and video card. This is so that if you don't buy them you can still use your computer. A dedicated card is a card that can be hooked up to a mobo. If you were to go to a store and see a video card that is a dedicated video card. That video card has no purpose other than to do graphical calculations. An intergrated card I believe will use your processor to do the graphical calculations. This is simliar for sound card. Most people don't need a dedicated sound card, but it seems like you like music therefore that would be a suggestion to go with. You will definitly need a dedicated video card as you seem to want to watch movies and do photoshop. (integrated cards are very crappy compared to a dedicated card)
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