>My machine did come with 512, it's base memory was 256 and those were the prices last night to have put 512 into it. Dell ends up having weekly/daily specials so nothing remains constant.

True enough. Dell overcharges for memory beyond its "base" specs. Add Crucial's low prices to the fact that they seem to know memory specs for Dell machines better than Dell does and that's where I go first. After being sent incompatible parts by Dell for two separate PowerEdge servers (in one case twice, ordered by service tag on-line then by a real live human who swore up and down that the second part would work), then having Crucial deliver the right part first time, well, I'm a convert.