Conroe (unlinke AMD's AM2 socket) is a new CPU architechture by Intel, that will by launched sometime in July.
Basically,
the "value" processors keep up, or surpase the "top of the line" processors today. (think FX60) So its not worth it for you to upgrade to a technology that has no upgradability, specially since you are starting from scratch, and AMD's AM2 is simply support for DDR2 ram. (in short, nothing revolutionary yet on AMD's side)
In my case,
I have some of the newest possible components today, so Im not upgrading right away, the performance jump would not be HUGE to me quite yet.
For you.
Your old system P4 @ 2.4ghz is definitelly getting a bit long in the tooth, BUT its still fast enough to last you a month to wait for better tech thats around the corner.
If the technology was several months out, I'd say go aghead and upgrade NOW, but its so close its not worth it to not wait.
-Longhorn
Is the next version of the Windows operating system, but dont worry about it, its at least a year away for now.
:D