rocket boots, they are so much cheaper with cartel coins than credits. Look thru your legacy and see what you can buy with them as things seem to be cheaper with coins than credits.
But I mention rocket boots because they let you get thru places faster where your speeder won't let you. Plus they are just cool
You have a decent chance of getting a speeder with the packs, I bought 4 packs and have 3 Crimons Claws and a Stap out of them. The packs also drop some good crafting material almost 90% of the time. At least they did for me.