[ubuntu] Good donor PC for a budget Ubuntu HTPC build?

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http://ubuntuforums.org – An acquaintance was getting rid of a mid tower he was using as a server so I negotiated him down to $75 for the following: Case - Antec P182 mid tower Mobo - Gigabyte EP45-UD3P ver. 1.1 Processor - Core 2 Duo E8400 3.0GHz HDD - failing. I'll need to get something else. Graphics - HIS Radeon HD 5850 Optical drives - LG Blu-ray RW drive and a DVD-RW drive PSU - Corsair HX620w RAM - Corsair 4GB DDR2 1066 CPU cooler - unknown but its big I figured the modular PSU and Blu-ray drive were worth $75 alone. I'm a bit new to building my own PC but I have thoughts of dropping these parts into a new H (Hardware)