You'll get more use out of the Swarmlord, but to be honest, I'd get another Start Collecting box right away. More Warriors would be a good idea and a Tyranid Prime with Warriors isn't as bad as it used to be. They get a very valuable buff for their Venom Cannon.
The bread and butter are Genestealers right now though so pick yourself up twenty of those or so. They're very well worth the points.
Biovores are another big impact unit now, dishing out Mortal Wounds and blocking mobility of large groundpounding models, a plus either way you cut it.
But with the Codex not horribly far off, one thing I'd consider is what Hive Fleet you want to go with. We can only guess what they do, if they will even do anything, but traditionally Leviathan was the flyer heavy Hive, Kraken liked underground Deep Strike and deployment tricks and Behemoth liked massive swarms. Just something to keep in mind just in case we get Chapter Tactics and make use of them Keyword Abilities that make us choose.
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