Well, I'll probably check out my most successful spaceplane designs to see if they still fly properly. Then I'll get to work on my Super Fueler SSTO (the goal of which is to get a full Kerbodyne tank to a 125km orbit, dock with a station, and return to KSC), which will hopefully have much less lag and much more space. Once the few mods I do use are updated, I'll get working on the rockets; culminating in a career mode where I put a kerbal on all of the planets (at least), on hard mode this time!