1) I second skulemate, need more info before we can give "the best"
how big is your case, etc.?
2) Check out caffinehogs "where to get watercooling supplies" sticky
http://forum.oc-forums.com/vb/showthread.php?s=&threadid=126143
3)
http://www.aquastealth.com/ <IMHO good starter kit here >
http://www.dangerden.com/
http://www.dtekcustoms.com/
are just three common places to get stuff.
4) QUICK review, you need
heatercore / radiator <go heatercore, dtek, aquastealth links have prefitted heatecores, or just get a cheap car one>
waterblock <religous arguments over whoose best here>
pump <ehiem, via seem to be most popular>
tubing and fittings
fans
shrouds (can make from cardboard
)
waterwetter / anti growing things liquid
5) Get a real heatercore and pump. NOT a koolance type radiator, and get a solid, well recomended pump that others have used.
6) Ya, fans can get annoying (15 cpu fans on my farm, NONE in a case to muffle the sound .........
)
Have fun!