GIVE ME A SUGGESTION

[tminer]

                                       i am a newbie in bitcoin mining.


                        i  am planinig to buy any one of the following gcard as per my budget.


1. hd radeon 6870

       or

2.  hd radeon 6950

      or

3.  hd radeon 6770x2 [two 6770]


please give me a suggestion to choose which one from it. or suggest any other g.card in similar price range.
 
i would also like to know how much i can earn/month with above.

[BRules]

here you can see the mining hardware comparison

http://en.bitcoin.it/wiki/Mining_hardware_comparison

and here you can calculate how much you can earn based on your processing power:

http://deepbit.net/stats

but remember that on the beginning of 2013 the amount mined will decrease a half

[Blazr]

but remember that on the beginning of 2013 the amount mined will decrease a half

Actually its at block #210000 which will be at the end of this month.

[tminer]

here you can see the mining hardware comparison

http://en.bitcoin.it/wiki/Mining_hardware_comparison

and here you can calculate how much you can earn based on your processing power:

http://deepbit.net/stats

but remember that on the beginning of 2013 the amount mined will decrease a half

                         see

                  Mhash/s -------> min           upto

       hd 6870                         232.47          375

                         
        hd 6950                        272              432


  hd radeon 6770x2                 464              470


these are the things i get from the link.

but can anyone suggest a realistic figure.
 i mean any user using these configuration   or have knowledge about them.