What do I need to look for when buying a motherboard?

[S1N1337]

I know about the CPU socket type being compatible with your CPU and the Memory standard being compatible with your RAM, but what is really separating the ~100 dollar motherboards from the 300+ motherboards? In my opinion it doesn't make sense to have a CPU to have a lot of room for upgrading. New CPUs come out that don't support your socket type, or new ram that doesn't fit, I just don't see the point in expensive motherboards. Can anyone clarify?

[WarriorXK]

Usually just aim for a motherboard with 2xPCIe 8X slots and the connectivity that you require, those 300+ motherboards are usually special boards with features you most likely wont use or are aimed at overclocking.

[Shadaez]

Good onboard sound, more RAM slots, more PCI-E slots, Crossfire/SLI support, better chipsets, more fan slots, etc. Nothing that's really worth paying for, most of the time.