Sorry. I didn’t realize you were in New Zealand. I am by no means an expert at this game so please take what I say with a grain of salt and just one opinion. Do have a side you like to play more as? If so, start there. If not, and you’re going to add more ships:
Victory Class SD gives you Motti and some great cards. It’s old enough now in the cycle you can probably find a good deal on this ship.
The CR90 is a work horse for the rebels so always a good ship to have another copy of.
Gladiator is out of the meta at the moment and can be killed before it can get in range if you’re not careful, but when it hits it hits hard.
I love the Interdictor. The ability to slow or speed up an enemy ship can be really devastating to your opponents plans. They have good shields, weapons, hull and engineering.
Look at the Imperial Cruiser. It’s got some good fire power and will survive better than a raider although there are some really nasty things you can do with a raider if you can survive long enough to get past fighters and close to a ship.
If you want an ISD for the rebels look at the Phoenix One. You need two of them to fly together, but they’ll match up against and ISD well and phoenix one gives some good card.
Hammerhead and Imperial Carrier just came out and add some interesting new cards that use 2 slots but let you board enemy ships and do some damage. I have them but haven’t gotten to try them.
FFG just updated the FAQ on the game a few weeks ago and nerfed a lot of the ships. Does it matter for playing with your friends? No, but in case you decide to play at a local game spot just beware so you don’t show up with a nerfed fleet.
Finally there are the assault carrier and rebel transports. They used be a great way to duck and weave with your admiral. Just throw them in one of those and fly circles around every ship. I thought it was kind of dumb, but I get it. Well that got nerfed in the update so now they’re a little more in check. The ships have a specific support use. So unless you have a build that focuses on augmenting your other ships, right now I would say hold off on them.
Now I just wish you were closer, so we could play.