Christi,
Once you get a DEM what will you be using it for? What are the spatial resolutions/accuracies required for your project? When you say you have 2ft contours, remember that it's only in the Z that you have 2ft resolution. Steve's point in the Hawaii data (which I haven't looked at) is that in the X,Y some of those contours are 50ft apart. To further his point - If you have don't have 2ft resolution in x,y within your real data, then a raster with 2ft cellsizes is probably overkill.
You can get 10m DEM's for free for pretty much all of America from USGS if that resolution would fit your requirements. If you have access to the professional photogrammetrist who derived the data, you should ask them what they think a good resolution is for the data. Also, many digital photogrammetry applications output surfaces as rasters or TIN's directly, then contours are derived from those. They may already have the raster your looking for.
Another option is to create a TIN/Terrain from your contours, then convert that to raster at varying cellsizes to find an appropriate one for your needs.
Regards,
Eric