I have $70 of Amazon credit burning a hole in my pocket and need to decide what to spend it on. I currently have at least one of every wave 7 and earlier expansion except for the Kihraxz. I do not have the Gozanti or any wave 8 ships. I am leaning towards getting the Gozanti and one wave 8 ship, but I've been so busy lately, I haven't kept up on the latest trends (other than hearing about triple toilet seats, which I'm too poor to field). What do you all think I should do?

As for my preferences, I play Imperial most often, but I'm looking to trying more Scum and Rebels. I'm mostly just looking to enjoy the new cards and twists presented by the latest expansions. I haven't done much epic, but I'm looking to start. I'll likely get all the expansions eventually, but it may be a while.

tl;dr - What should I get first from wave 8 and/or Gozanti expansions?

Skip the Gozanti for now; it's really only necessary if you want to run a narrow subset of bleeding-edge competitive Imperial lists. I think you'll get better bang for your buck with one of each in Wave 8, which you can probably do with the typical discount on Amazon.

The Tie Phantom is just plain fun..

The Tie interceptor is a good solid ship .. Imperial aces is a must at some point..The imperial Raider gives you the fix for the tie advanced and you may be able to pick it up for 70 even though it normally sells for 100.. I use the tie advanced a lot with the upgrades from the Raider set

The imperial veterans will be out very soon if you can hold on ..

Buy one of every thing is the best overall option,

This way you have all the ships/cards and then YOU can decide on what is best for you

The Gozanti looks very cool on your shelf, but if you don't play Epic of Aturi Cluster, I don't see how you'd need it. Speaking as a proud owner of one, btw.