Here is a chart comparing the lubricity levels/effects of some diesel fuel additives. Although this is only comparing lubricity, it is a very important factor in ULSD fuels. Pick an additive that has good lubricity results, a water dispersant, cetane boost and a detergent. If in cold climates an anti-gelling agent.
The full report can be found at the pdf attachment at the bottom of this post.
Here is a link to some additional good info on diesel fuel additives.