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450w psu is piddly and will die, them calculations never take into account that you will likely add 2+ fans, plug in a half a dozen usb things to charge and add another hdd or 2. Have a corsair 650w non modular in my pc and it's been going strong for a few years. Also avoid cheap psus and all the corsair "builder" series.
Also buy a bitfenix case, they are lesser known but a good brand and come coated in some funky stuff that makes them last well. Even the cheaper ones in the range have lower case psu and other funky stuff.
https://www.overclockers.co.uk/showproduct.php?prodid=CA-180-BX&groupid=2362&catid=1850
Thanks, guys - any other thoughts about hardware? I'm guessing I could buy this bits myself for cheaper.