memory and cooling ?

[skiller]

Hello

my new system is a:
-Asus P5WD2
-Pentium D 830
-GeForce 7800GTX
-Case Thermaltake VA8000BWS

my question are the following:

is the Geil Dual Channel 2048MB PC4200 DDR2 533MHz Memory (2 x 1024MB) good for my system or can i have a better memory for less than $250?

A link to the memory
http://www.amazon.com/exec/obidos/t...6516?_encoding=UTF8&m=A1O4WJPWRZHALA&v=glance

would it be ok to have liquid cooling for overclocking my Pentium D at least to 3.6Ghz or should i go with air cooling?

What is better for me, more memory or more memory speed?

(I Work with soft like photoshop, corel, macromedia studio, 3ds max, video editing, and i'm also a gamer)

Thanks In Advanced.