LV38_Eagle, brother, you speak the truth. However, if you use 2 sticks instead of one, you are using up more ram slots as opposed to a 1-stick setup, which can make future upgrading harder and possibly more expensive since most (newer) motherboards support 1.5-2 GB (3GB if you run a server platform!) of memory, but only 3-4 slots. It all depends what is more important to you and your specific needs.
And yes, DDR memory is about twice as fast as SDR, and isn't even that much more expensive!