Which 580 should I get?

[Anders_And]

Which one of the following 580s should I consider? Which one of them will give me the best performance? is the 3gig version alot better or just waste of memory? and why do the DDR5 show show such a diff. in speed? (1ghz vs 4Ghz)

MSI GeForce GTX580 TwinFrozr II aktiv Retail
1,5 GB GDDR5 (1 GHz)
384 Bit
800 MHz

or

Gigabyte GeForce GTX580 aktiv Retail
1,5 GB GDDR5 (4 GHz)
384 Bit
795 MHz

or

ASUS GeForce GTX580 aktiv Retail
1,5 GB GDDR5 (4 GHz)
384 Bit
782 MHz

or

Zotac GeForce GTX580 aktiv Retail
3 GB DDR5 (4 GHz)
772 MHz
DirectX Version: 11

or

Zotac GeForce GTX580 AMP2! Edition aktiv Retail
3 GB DDR5 (1,25 GHz)
: 384 Bit
815 MHz

or

Palit GeForce GTX580 aktiv Retail
1,5 GB DDR5 (4 GHz)
384 Bit
783 MHz

or

MSI GeForce GTX580 Twin Frozer III aktiv Retail
1536 MB GDDR5 (4 GHz)
384 Bit
: 810 MHz

or

Zotac Geforce GTX580 AMP! Edition aktiv Retail
1536 MB GDDR5 SDRAM (4,1 GHz)
384-bit
815 MHz

Thx and best regards