Bookcases!

I know I posted a while ago about the awesome bookcases I got from Borders when it was going out of business, and now I've found that I'm completely out of space again... kind of a bummer when I have all these lovely books, and they're being stacked on top of others in my shelves, as well being stacked on the floor in front of my lovely shelves {a good portion of these are from my book-binging the last few months, and are a literal TBR pile}...

{And these are my overly stuffed bookcases at the moment}

My hubs told me a while ago that I could buy a new bookcase to go up with these ones so my books don't have to hand out on the floor... but I just don't know which one to buy!  I would ideally have like to purchase on that matches the two I have, but as no one is selling a Borders bookcase I'm a little out of luck!  Here are a couple I've been looking at online...

From Target:

The Threshold Carson 5 Shelf Bookcase.  This was the first bookcase I bought when the hubs and I got our first apartment, before I was a book-buying fiend.  This now houses D's books {and it almost full}.  However, its a bit shorter than the cases I have downstairs and it only has 5 shelves {while they're taller shelves, I don't have a bunch of tall books that don't already have a home on my cases downstairs}.

From Ikea:

The Billy Bookcase.  I like this one because it kinda matches the ones I have downstairs color-wise.  Plus, the shelves are deep and are quite hefty, holding a decent weight per shelf.

The Hemnes Bookcase.  Both Little D and I have dressers from this line at Ikea, and they've held up really well!  I like that it's a little more decorative looking than the Billy bookcase, but doesn't hold nearly as much per shelf.  Both the Hemnes and the Billy bookcases are rather deep, so I could double stack if I need to.

My question, fellow bloggers, is this: which case should I get?  The price isn't took much of a concern, and I think I'm leaning more towards the Billy bookcase since it will match the others I already have, but my mind isn't made up yet.  Help!  Also, do you have a bookcase that you absolutely love and would recommend?