Suggestion for a new star: a small (only 2x bigger than Kerbin) red dwarf star. Solar panels cannot be fully operational off of such low light and must stick to around 10-20% of the maximum power output (making thermostatic generators a little more useful, unless you don't mind solar wings on your tiny probe). However, it should have special compatibility with resource-based mods that make resources spawn more frequently, making converter/ harvester ships more functional in this system.