I have downloaded the user manual of some of the board and here what I found.
Some of the boards with the 430 chipset use a geforce 6100 and other use a 6150. Some have gigabit ethernet. Some use soundmax adi audio and other use acl662 (my board uses a alc888). Some have a extra pci-e x1 + pci slot. Some only have 2 memory slot. Some have 8 Mb bios chip and other have a 4 Mb (my is 4 Mb , it think).
Boards with nForce 430 OR 430 mcp chipset:
m2n / m2n DH / m2n Telsky (430 mcp, no video, 4x DIMM, extra pci/pcie x1, gigabit lan, soundmax, 4Mb bios)
m2n-mx (430 mcp, 6100, 4x DIMM, gigabit lan, soundmax, 4Mb bios)
m2n-mx se (430, 6100, 2x DIMM, no pcie x1, 100Mb lan, soundmax, 2 sata, 4Mb bios)
m2n-mx se plus (430, 6100, 2x DIMM, no pcie x1, 100Mb lan, soundmax, 2 sata, 8Mb bios)
m2n-vm se (430 MCP, 4x DIMM, 6100, soundmax, gigabit lan, 4 Mb bios)
m2n-x plus (430, 2x DIMM, extra pci/pcie x1, ALC662, 100Mb lan, 8 Mb bios)
m2n-xe (430, 2x DIMM, extra pci/pcie x1, alc662, gigabit lan, 8 Mb bios)
m2npv-mx (430 mcp, 6150, 4x DIMM, 2 IDE, soundmax, gigabit lan/marvel, 4 Mb bios)
m2npv-vm (430 mcp, 6150, 4x DIMM, 2 IDE, soundmax, gigabit lan/marvel, 4 Mb bios)
Boards with other chipset:
m2n-e
m2n-e sli
m2n-plus sli vista
m2n-sli
m2n-sli deluxe
m2n-x
m2n32 Deluxe wifi
m2n32 Premium
m2n32 WS Pro
m2n4-sli
m2n68
m2n68 plus
m2n68-am
m2n68-am plus
m2n68-am se
m2n68-am se2
m2n68-cm
m2n68-vm
m2nbp-vm csm
Board I have not looked at yet (I assuming these boards are slight variation of the boards above):
m2n 1394
m2n-cm dvi
m2n-plus sli vista edition
m2n-vm dh
m2n-vm dvi
m2n-vm hdmi
m2n-vm se hdmi
m2n-xm/dvi2