While oil based enamels are good for certain effects seriously go with the water based acrylics for most of your painting. It looks better and is just so much easier to deal with in the long run.
Also a second for the Army Painter (or Vallejo Game color for that matter) over the GW paints. 90% of this is simply bottle design.
And Krylon 1311 sealer will give your minis a clear coat that will take all kinds of abuse.
