If updating my bios which version I update to ?

it should be obvious

firstly you NEVER update a BIOS unless you NEED to

secondly to AVOID problems in future, it MIGHT be advisable to also apply

updates for actual faults.

so

F7 looks like a very good idea, but not necessary unless you suspect a fault

F8 a waste of time

F9 we havnt got a clue. Maybe they mean compatibility with windows 8...maybe

F10c well if your LAN is perfect, why bother.

so it looks like F7 is worth doing, but only if your CPU is playing up or you are thinking of upgrading

remember applying anew bios places your system at risk of being permanently damaged

by the process.

But Gigabyte are known to try very hard with failsafe options so that should be avoidable.