All you really need is the CPU water block, but most folks add the GPU block as well, it just makes sense. No, water cooling is not noisy at all unless you get a cheap system with a noisy pump.
I understand the Zahlman is a nice kit, altho I don't use water cooling so can't speak from experience.
One thing to remember about changing from air cooling to water is this: part of the air flow from the CPU HS/F is used to cool the Power Regulator transistors at the back of the main board, and sometimes the heat pipe from the North Bridge cooler connects to a heat sink there as well, like on my Abit KN9 SLI.
Without airflow from the HS/F the PWM transistors can and do get very hot and you can have stability issues or even burn up the board. So some kind of cooling is needed for that area of the main board.
Water cooling done right is far too expensive for me, a hassle, can leak, and I feel is only needed if you are over clocking a lot. Chris.
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1) KN9 SLI, AMD X2 6400+, 2Gb OCZ 6400, EVGA GTX260 896Mb, 320Gb + 160Gb SATA II, LG Lightscribe, 600w CM, Vista Home Premium SP1
2)AX78, Phenom 9500, 2Gb OCZ PC6400, XFX 8400, CDRW, XP Pro SP2
3)AX78, Phenom 9500, 2Gb OCZ PC6400, EVGA 8800GT/SC, CDRW, XP Pro SP2
4)AX78, Phenom 9600, 2Gb OCZ PC6400, EVGA 8800GTS, CDRW, XP Pro SP2.
5)AX78, Phenom 9600, 2Gb OCZ PC6400, EVGA 9800GTX, CDRW/DVD, XP Pro SP2.
http://www.viaarena.com/default.aspx?PageID=2VIA Drivers http://www.abit-wolves.com/
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