he means pc case, not all rigs have psu's included, ive got a antec 300 which is good for air flow,as gonza said get a good psu,im stuck at the stage of upgrading my psu if i buy a new gpu card,
if you can look up cpu cutout if you plan to buy a large heat sink for your cpu, some heatsinks come with weak plastic pins that break easy such as in ARCTIC COOLING pro 7, so instead of the generic push pins like on intels heatsinks, you put the cpu mount behind your motherboard which is alot better and secure
http://benchmarkreviews.com/images/r...unting_Kit.jpg
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cfw 3.55 > OFW 4.25 due to some noob who wanted to play f1 2012 :(, rendered it useless as well as that 500gb inside.