You can vote for five.
Like the last poll, all obsolete weapons and support biomorphs are removed. According to Lexicanum.
Same with class exclusive upgrades, only Lictors get Chameleonic Skin and Trygons are the only Nids that have Containment Spines.
This was a bit easier as Nids seem to have less restrictions on their melee weapons as only highly ranked Space Marine get power weapons. Though there is a good reason for that.
Not going to bother with more polls for a while.
last poll
http://www.40ksource.com/common/smf/index.php?topic=2916.0