If its for the stock hsf then you should use the stock stuff that comes pre-applied to the bottom of the hsf, it works better then other paste when used with the stock cooler.
For 400Mhz FSB youll need an aftermarket HSF if you want comfortable temps. You can get a ACF7 that comes with TX-1 pre-applied (pretty much the same as Ceramique) or a Hyper TX or a Hyper 6+ (sale on the egg), any of them for $30.
The next question that should be asked (even though I am sure it has been asked in other threads)... which application method should people use for thermal paste, the blob or the spread?
why use high end thermal paste on a stock heatsink?
if using the stock heatsink, use the thermal pad on it,
if using aftermarket cooler, you can use both artic silver or ceramic.
if you want to overclock, a aftermarket cooler is recommended.
succes
For single core CPU use the blurb as its the easiest and most effective (even for anything if youre lazy/non-skilled).
But for a C2D use a credit card of something to spread it, dont mind the edges too much as theyll get their share once the HSF is in its place.