I'm sending mine out about april/may time for a june 2014 but only because ours is a friday wedding.
I was going to send them out around september time before everyone books holidays etc. but then I though if I'm sending my invites out around jan/feb '14 it'd be too close together!
But as yours is a sat you'll be fine to send them anywhere from a year and under
were getting married 14.02.14 its valentines day and a friday and have immediate family in the Isle Of Man so were sending ours out on valentines day next year. x