dual channel or just upgrade that is the ?

[UMDivX]

Well here is the situation:

I currently have a 2.66ghz P4 with a gig of pc3500 ram, on an Asus P4B533-E mobo which doesnt run in Dual channel. I was wanting to either:

A.) get a AMD64 939pin (the more expensive one that supports dual channel memeory) chip with a Dual channel memory board or

B.) save my money and get new mobo for my CPU so I can OverClock the chip better and take advantage of the dual channel memory.

So basicly is dual channel worth it or should i save my money all together and save up for the AMD64 cpu?

Thanks for the help,
-UMDivX