What it should be 1) Priced below $1200 2) Quiet - this may or may not involve watercooling. The missus will not be impressed if I end up with a PC that sounds like a jet turbine. 3) Sleek / Minimalist - as above 4) Fast - mainly for gaming, but will also need to be capable of reasonable processing and video editing. Fast boot times - maybe SSD? 5) Upgradable 6) Not requiring an upgrade for at least 3 or 4 years. 7) Reliable - quality components, particularly in the PSU.
What it isn't 1) No bling / LEDs 2) Not a media centre - doesn't need massive amounts of storage. 3) Doesn't need to support multiple high resolution displays (so 4GB graphics cards / SLI / Crossfire unlikely) 4) Doesn't need monitors / peripherals