Publishers

EUROPEAN TIER
1) Folio Society
2) Folioplus classiques - Folio - GALLIMARD
3) Quatro
4) Folger
5) Brittanica Great Books
6) Baronius (Catholic)
7) Leob

ACID FREE PAPER TIER
1) Everyman's Library (Hardcover)
2) Library of America (high quality hardcovers non-acid, but really limited selection)
3) Norton Critical Edition
4) Dalkey Archive - New Directions - Milkweed - Nonpariel - re.press Twisted Sppon - Archipelago
5) New York Review Books Classics

ACID PAPER TIER
1) Penguin Books
2) Oxford World Classics
3) Hackett
4) Vintage
5) Modern Library
6) Harper Perennial

JUST THE TEXT TIER
1) B&N
2) Wordsworth
2) Simon & Schuster
3) Signet (subsidiary of Penguin; without the introduction and reading lists; it is shit.)
4) Bantam Classics
5) Dover Thrift

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I don't really care about classics publishers. I just go with whatever has the mostly-agreed-upon best translation. That does seem to be Penguin a lot of the time.

For other publishers, I really enjoy New York Review Books, New Directions, Dalkey Archive, Twisted Spoon Press, Wakefield Press (USA), Exact Change, Atlas Press and Green Integer.
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Dalkey Archive, New Directions, NYRB, Pushkin Press, Melville House, Kodansha, Kurodahan, Alfaguara, Seix Barral, Ediciones Austral, etc.
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Gombrowicz's Diary, more Walser, Satantango, a lot of smaller releases.

Twisted Spoon Press, Peirene Press, Exact Change, Wakefield Press and Archipelago Books
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I have a ton that I really love - Twisted Spoon Press, Wakefield Press, Peirene Press, Green Integer, Dalkey Archive, Dedalus, Exact Change, Atlas Press, Archipelago Books, etc. Not sure I could pick one favorite
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NYRB Classics (not publisher, but a series)
Twisted Spoon Press
New Directions
Wakefield Press (USA)
Archipelago Books
Dalkey Archive
Exact Change

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Akashic Books, Bitter Lemon Press, New Pulp Press, Archipelago Books, NYRB, Europa Editions, Busted Flush, Underland Press, Melville House, Dalkey Archive, Soho, new Directions, City Lights, Bleak House Books.

"[T]here are some excellent small presses that are out there, who operate like the best record labels. They have good, tight collections, to the point where any book they are putting out is going to be worth your time. Trying to fill aspects of the publishing world that aren't being filled by the majors, or bringing back to life long-lost classics, these presses offer fantastic books by authors you may or may not have heard of. Some specialize in depth in a certain type of genre, others cover more ground. In the interest of keeping you searching and digging through the stacks, instead of the flash/bang trip, here's a list of some of these presses:

Akashic Books, Bitter Lemon Press, New Pulp Press, Archipelago Books, NYRB, Europa Editions, Busted Flush, Underland Press, Melville House, Dalkey Archive, Soho, new Directions, City Lights, Bleak House Books.

Next time you're in, carry that list with you. Look down the spines of the books and pay attention to the publisher instead of the author or title. You'll find some absolute gems this way. And isn't that what buying books is all about?"

http://farleysbookshop.blogspot.com/2010/05/how-to-buy-better-books.html