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By the way, do you hear high pitches pump noises in watercooling? Are they more annoying than normal fan sound? Or do they disappear after bubbles settle in. Also, Do the fans cooling rads work on fixed speed? Wouldnt they be loud?

High pitch, not really, I have mainly used MCP655 pumps, and one 355, none of them were loud of high pitched, the 655 was a mellow mid tone hum.  Granted I have not tried all of the pumps, far from it, but never heard anything overly high pitched.  The air bubbles you will hear them, and it is common to hear them until clear, and they can take days to clear depending on MANY variables.  Fans on radiators are not necessarily loud, it depends on several variables:
1) the specific fan, some are just louder than others
2) the RPM the fan is running at, for example I run some fans that are rather loud, but on fan controllers so they run usually around 1/2 speed and cool well fairly quietly, however when I am pushing my clocks HARD and things are heating up I crank up the fans, deal with the noise and get the temps down 3)  the radiator, depending on fin design they can cause turbulence and whistling through them, the old BI Stealth was known for that, with the same fans it was louder than the BI Extreme.  A secondary way a radiator can be blamed, indirectly if you use a radiator VERY thick, like a Monsta, it just takes more airflow and pressure to effectively push through it.
 
There are more variables, but those are the major ones.