ATI HD 4870 vs 5770 vs 5870 on Mac Pro (3,1) 2.8 Octo Core

Im sorry if I'm asking a noob question but I'm having a hard time trying to figure out which Video Card I should get. To me it appears the higher the Model number the better the card.
What throws me off is the face that the 4870 cost more than the 5770 which appears to have better specs. I don't think I can afford the 5870 at this time so depending on the replies I might not even consider the 5870.
I want a Video Card to run in Windows 7 under BootCamp for gaming. I also want to just plug in the New 27" Apple LED with no issues - unlike my current ATI HD 2600 card.
These are the questions I have...
(1) Is there a HUGE gaming performance difference between the 5870 and the 5770?
(2) Why does the older 4870 cost more than the 5770?
(3) Why do some recommend using a DVI to Mini Display Port adapter ($200) when you can get a New Video Card for $249.00?
I would also appreciate any links to read up on if you have any.
I plan to sell my 30" Apple Cinema Display to pay for a New 27" Apple LED and a New Video Card.
PS - Any other alternatives to the 27" Apple LED? Any of the competition have a similar product?
Thanks for your time.

The 4870 is a better card than the 5770; more bandwidth.
It just saves a test cycle when one card is already known to be slower than another.
More results:
http://barefeats.com/wst10g.html
http://www.insidemacgames.com/forum/index.php?showtopic=40254
The only way a 5770 comes close to or beats a 5870 is in a crossfire vs single card situation:
http://www.overclock.net/ati/644665-radeon-5770-cf-vs-5870-vs.html
The 3 cards are on this page:
http://www.guru3d.com/article/radeon-hd-5770-review-test/14
Get the 5870.

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