new build for web/video/graphic design

hey guys and gals, several months ago i came here to build a system for my church and all the help was amazing and i built it for a great price now i want to change out my personal computer, it is from 2003 so you know how that goes and i try to run new cs3 apps and video software with some luck it works here is what i am focused on

i have 1500-2000 but start with 1500 and maybe work my way up depending on the need

i have xp so i dont know if i want to go to vista, i have a monitor but could use help on a new one or two (not included in price)

i do web/video/graphic design as well as edit some audio i use cs3 master, audacity, a couple diff video software easy to detailed

i know i dont need an amazing video card for photoshop but what about premire or other video stuff,

i have been told to get multiple hdd and go raid, know about it but would that help what i want to do,

i have been looking at the q6600 because i put that in the other computer and works great, dont know about mobo, i want at least 1 internal hdd and possibly an external to backup/render/travel

my version of xp only sees like 3.25 gigs of ram why i thought of upgrading but have been told not to

how much ps do i need / cooling

any extras

thank you for your time

i would get this

cpu e8400 core 2 duo
or q6600 if you programs can use the quad core
(if some one knows if cs3 is say something)

ram 8gb ddr2 800
sorry fore this you need to go with vista 64 bit,small shudder, but i would do it

video nvida 9600
or ati 4850 if you can find some ware you need it

hdd no raid there is no real need fore it
get as much space as you can with sata 3.0gps 7200 rpm
if you want 150gb velociraptor fore a main boot drive

motherboard (i am sheer some one can point out something good)
just get one that supports everything you need

psu then use a online w calculator to find what you need.
would end up being 500w or 600w

thank you for the replies, 1 ? though

why do i need 2 times the amount of ram for 64bit vista compared to 32bit xp, is it just because it recongnizes it or is it that much more needed to run the bigger os

cool thanks, anyone know some goo memory to use, i have used gskill and it works good but i didn't know if i could get more pack for punch if it would help

seriously no one has any other help for a very needy guy looking to build a great computer from great help from this community