Ok, so I was wondering how this was going to work, if you could buy borderlands packs in the store or if it would be mixed. I guess I have to be 'that guy' and say that there really should be the option to buy 'seed set' packs and the option to buy 'borderlands set' packs.

reasons:
1) it devalues seed set cards;
2) when you have more than 2 sets, it becomes harder and harder to get the 'new' set, so at some point it's going to have to change over; and
3) if I'm a player and only want borderlands because it's new, it sucks to open a pack and get old and new cards (the whiner reason, but legit).

Yes you will have that option tomorrow.

well, I'll just shut up then.

I did hear some conversations today expressing frustration about not knowing what domain to choose for the new domain league since the market hasn't been updated yet. is it possible to update and leave them non-tradable (if that's the issue?)

Choice for the domain league right now seems pretty easy: Take Chaos.

Probably should be another thread...

Now im not sure which boosters to start investing in.
Borderlands or Seedpacks.
I;m thinking borderlands, cos its probably more worthy as investment to sell, so i can fund me buying more seed cards(the cheaper ones for now).

Thoughts?

I would recommend borderlands packs for 2 reasons. One being the higher value you already mentioned, and another is that you will get more chaos or CI cards than you would get any single domain from seed set packs, which helps with deck making.