anyone can recommend me a quiet mouse?
don't need to be high end as long as it's quiet.
my current mouse is razor salmosa and at night the sound click click is really loud that it bothers my room mate

Try playing FPS game then u should notice some difference
If u prefer dota many would suggest Razer Naga

For Fps game many choice for you such as

Steesseries :Ikari  rm200++ , Xai rm380++
Razer :Deathadder 180 ++
Logitech : G400 rm95++(If you can find Legendary mx518 is better) -,=
Microsoft : Ie 3.0 rm130 ++(It also have Steelseries version and cost about 200++)

Since ur budget is 150
i Suggest u microsoft ie 3.0 or logitech g400(better if u can find mx518 the older version)
for me microsoft ie 3.0 still work fine after i bought it around 3-4 years ago..

there is 2 types of G400 in the market, one with prediction and one without. But actually neither one makes a huge difference in gaming.

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Added on August 15, 2012, 4:35 pm
try Heavyarm at SS15.

What the difference between RM20 mouse and gaming mouse?
If just the extra buttons on the mouse then I dun think I'll get one, keyboard enough buttons already

Yep. The link below got the internal pix.
http://www.pcwaishe.cn/thread-180808-1-1.html