Deciding what to play

One of the biggest problems in having a lot of armies that you enjoy playing is deciding which one to play. Liam will be hosting an 1850 event next weekend. I have still not figured what to run. Marines seem the most obvious choice but need a lot of work right now. Crons and DH are both table ready but not so competitive at the current levels, though some plasma and melta vets could be fun. Thankfully I have a week to decided