When I'm considering building or modifying a home-built PC, I check out these parts manufacturers.
Abee
Antec
Asktech
Bitfenix
Century
Coolermaster
Corsair
IN WIN
Lian Li
Scythe
Shuttle
Silverstone
Thermaltake
CPU Coolers
Akasa
Coolermaster
Noctua - expensive, but the best CPU coolers money can buy
Scythe
Zalman