Penso que estas estão todas na mesma gama de preços:
P5N32-E SLI
http://www.*****.pt/products_images/MBASAP5N32ESLI.jpg
Chipset NVIDIA nForce® 680i SLI™ * Support SLI-Ready Memory Technology
Front Side Bus 1333**/1066/800/533 MHz
4 x DIMM, max. 8GB, DDR2-800/667/533
Expansion Slots
2 x PCI Express x16 slot, support NVIDIA® SLI™ technology, at full x16, x16 speed (blue)
1 x PCI Express x16, at x8 speed (white)
1 x PCI Express x1
2 x PCI 2.2
-----------------------------------------------------------------------------------
ASUS P5K-E WIFI
http://www.*****.pt/products_images/ASUSP5KEWIFI.jpg
Chipset Intel® P35 / ICH9R with Intel® Fast Memory Access Technology
Front Side Bus 1333 / 1066 / 800 MHz
Memory 4 x DIMM, max. 8GB, DDR2 1066*/800 / 667 MHz
Expansion Slots
2 x PCI-E x16 (blue @ x16 mode, black @ x4 or x1 mode) supports CrossFire Technology
2 x PCI-E x1
3 x PCI
----------------------------------------------------------------------------------
ASUS P5E
http://www.*****.pt/products_images/ASUSP5E.jpg
Chipset Intel® X38 / ICH9R with Intel® Fast Memory Access Technology
Front Side Bus 1600 / 1333 / 1066 / 800 MHz
Memory 4 x DIMM, max. 8GB, DDR2 1200 / 1066 / 800 / 667 MHz
Expansion Slots
2 x PCIe2.0 x16 (both @ x16 mode) supports CrossFire Technology
3 x PCIe x1
2 x PCI
------------------------------------------------------------------------------
ASUS P5N-T DELUXE
http://www.*****.pt/products_images/MBASAP5NTD.jpg
Chipset NVIDIA nForce 780i SLI
Front Side Bus 1333/1066/800 MHz
Memory 4 x DIMM, Max. 8 GB, DDR2 1066*/800/667
Expansion Slots
3 x PCIe x16 (blue @PCIe2.0 x16 mode, black @PCIe x16 mode) supports SLI Technology
2 x PCIe x1
1 x PCI
--------------------------------------------------------------------------------------
ASUS STRIKER EXTREME
http://www.*****.pt/products_images/MBASASTRIKEREXT775.jpg
Chipset NVIDIA nForce® 680i SLI™
Front Side Bus 1333** / 1066 / 800 / 533 MHz
4 x DIMM, max. 8GB, DDR2-800/667/533
Expansion Slots
2 x PCI Express x16 slot, support NVIDIA® SLI™ technology, at full x16, x16 speed(blue)
1 x PCI Express x16, at x8 speed(middle)
1 x PCI Express x1
2 x PCI 2.2
Estou muito confuso