You have a lot going on in that statement. I am not sure what you mean by 100 meter spacing? Do you mean 100 meter interval? Contours are usually reported in terms of intervals not spacing. Spline is fine for rubbersheeting as some of the other interpolations have other algorithms to balance it, but if you are looking for the interpolation to match the point value at the point then spline works fine. [ATTACH=CONFIG]18360[/ATTACH]
There is a older document that discusses the way the interpolations look at the values in the point that helps that I am attaching as well as the document that discusses it from ArcNews. So once you have the raster you should be able to generate the contours at a 100 meter interval to get the desired results.