It's that time of year again...

So I've been thinking, I want to grow my hair out to my natural color, but then again, it's getting kind of gross. It's not the much a difference, but when it is dirty, you can really tell I have one color on top and another on bottom. What should I do?
I can leave it be, so it turns back into Alaskan Blonde

Or I can go lighter again

Or I could just do the same color I have now

Or I could do something compleatly different. I could go black, brown, red, give me ideas people!