i like the blonde! i have had blonde hair on and off for the past 13 years or so. Everyone says they like me better with brown hair (I have pale skin and light green eyes, people say the blonde washes me out.. well, everyone except for my family).
I'd say if you are leaning towards the blonde than stay with it because it will be hard to get back. If you're unsure, stay where you are until you are 100%. there have been so many times i went dark than ended up trashing it to go back to blonde that same month because i hated it.