Like havoc said, the primary restriction is always budget. You start with a budget of whatever and then build around that. I usually end up going a bit over budget rather than under budget though.
So performance is the second thing I go for. I obviously also want my stuff to look pretty, so that's also a consideration I suppose.
My cable management is up to shit. I've tried to make it better but I fail horribly. I should perhaps, one day, just take everything apart and start over with the cable management attempt. /shrug
Luckily I have a HAF-X, so cooling, airflow and space is not a problem at all.




)