Questions about PSU, Fans,overclocking

[Domi2001]

Hya all
well finnaly i chose my case today im going for an chieftech those cases are fantastic 2 rear places to put 8x8 fans an 8x8 fan place on the HD cage and another place on the bottom
what 8x8 fans do you recomend? i need good air flow but silence is the key
im thinking on putting one on the HD cage and another on the back
also the chieftech PSU is any good? the guy told me it has a maximum peak of 315Watts wich is a much bigger value than normal PSU's have
do you think it is true?
Now my setup will be has following

epox8k3t+
512 Mb (either crucial or samsung pc2700)
athlon XP1800+ (unless Tbred comes out)
1 seagate barracuda 40g 7.200 rpm
1 seagate 40g 5.400rpm
1 maxtor 10 gig ( alone on IDE port serving has swapfille )
1 cdrw
1 dvdrom
soundblaster audigy
zoltrix tv capture

now with my 1.8 XP unlocked what kind of overclock you think i should be able to get???
also whats the best fan to use on the cpu????? (silent)