Orbital Science is at the top of my recommended mods list, what a great job by DMagic! It finally makes my probes look like they were actually made for science. Add ion+electron+neutral particle instruments and a UV imaging spectrometer and you'd have a complete geophysics suite. DMagic, if you're interested in including these parts, here are a couple of modern designs that you can base your models on: Particle Package: http://www.lpi.usra.edu/opag/jan2014/presentations/21_brandt.pdf (p.4) UV Spectrometer: http://lasp.colorado.edu/home/maven/science/instrument-package/iuvs/
