Thank you for the responses; I appreciate it!
Hide head slot is also on my list of things to possibly get.
My friend's sub runs out almost a week before mine (I'll have to double check the date), so I can try giving him my referral link then and I'll know if it works or not. For some reason I thought that it would, and so I wasn't going to bother with buying the items included in the Preferred Friends Bundle.
I have bought 1 inventory upgrade (accountwide) thus far. I've never had a character at high level...my highest one right now is only level 36, so I've not seen any end game content, etc. I have heard of HK-51 and Section X, but don't know much about them.
Before the sale ends I'll have just over 1500 CC. I'd like to get the Togruta...other than that, I'll see how far my CC get me. I know inventory/cargo/legacy storage are all good to have, though some other convenience/appearance things would be nice too. Even if the preferred bundle doesn't work right away, I could still get it after 3 months.
I do have characters on 2 different servers, so I'm a tad torn on some of the legacy unlocks... I'm in the USA and made a character on one of the US servers (level 26), but my friend is in the UK, so I made a character on a European server (level 36 now) and made a guild there (not that we have much unlocked). My friend tends to flit from game to game, so I'm not sure how long he'll play and I'm debating if I should unlock legacy things for the UK character legacy or the US one.
Anyway, again, I appreciate the explanations and recommendations. Maybe someone will have an answer about the referral link.