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[ubuntu] Advice for building a new machine?

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http://ubuntuforums.org – I'm going to be building a new system this winter as a replacement for my dell laptop-turned-desktop which has a twice broken screen, slowly dying HDD, and slowly dying USB. This'll be my first time building a computer... My goal: ...is to build a new, and better, system on a reasonable budget. I'm hoping I can get most components at lower prices and aim for mid-range performance - perhaps splurging a bit on the CPU :p. Also, my current computer has the intel media accelerator 950... and I absolutely hate it. I'm not much of a gamer, but I think it has been causing the performance of special effects in gnome and of my virtual machines to suffer. I'd expect to use this system for software development, virtual machine usage, insane multi-tasking, and perhaps some video editing or gaming in the future. What I already have: ...includes a 19" (1680x1050) screen, a usb mouse, a usb keyboard, and an external HD. Parts I'm contemplating for the new machine: Intel Core i5 (http://www.newegg.com/Product/Product.aspx?Item=N82E16819115215) LGA 1156 mobo (http://www.newegg.com/Product/Product.aspx?Item=N82E16813128405) GeForce 9600 GT (http://www.newegg.com/Product/Product.aspx?Item=N82E16814500111) DVD - (http://www.newegg.com/Product/Product.aspx?Item=N82E16827131061) Power Supply (http://www.newegg.com/Product/Product.aspx?Item=N82E16817104953) HDD (http://www.newegg.com/Product/Product.aspx?Item=N82E16822136098 ) Wifi (http://www.newegg.com/Product/Produc...82E16839121008) 4GB of DDR3 at 1333Mhz (http://www.newegg.com/Product/Produc...82E16820148262) Case (?) Probably also some cheap external speakers. I am pretty clueless about cases and would be a little concerned about getting a case that won't fit these components or where the motherboard won't line up with the gaps in the case. What I'd really like to know from you: > What do I need to know about cases? Will any "micro-ATX" case work? > Are there any compatability problems with the parts above? I tried to be sure that the CPU would work with the motherboard and that the motherboard had the slots needed for the other components... > Is everything compatible with ubuntu? I'd like to do an XP/Karmic dual-boot. It looked like the GPU had drivers for linux upon my brief research... > Will the Power Supply I've selected be enough? The GPU recommended 400W, but could other components put it over? The PS also said 400W "max", so perhaps 400W consistantly would overtax it... > Is there any other good advice to be given? My inexperience in this area could use your illumination! Thanks! (Hardware)