So plans change again. I was asked to join the xenos horde faction for the beer league so I elected to field my tyranids instead of the Eldar. The league requires a core list between 300 - 500 pts that includes one HQ and troop that will always be in you game list. I selected a flying Hive Tyrant and a Tervigon/Termagant combo to serve as my core, requiring a flying Tyrant model. So I caved and bought one. It is the first thing off the table and has already had a successful debut against my first league opponent.
So it looks like I am committed to Nids for the foreseeable future. Now back to work.