This is my pet subject, I have struggled with my hair for ages....I am almost completely grey and am 40, and have agonised for ages as sometimes I love grey hair (I have a very inspiring lady at work who went grey young and she has a sharp haircut, all grey, and looks SO glamorous every day and does NOT look old...) and other times I feel, well, I actually DO look old and I'm not ready.
So I have dyed at home and done what you are thinking of stickybun and gone for a lighter colour, but I find within 3 weeks A) it's gone a kind of brassy colour that I would NOT choose and B) the roots are REALLY quick to show and I can't be bothered, or arsed, or have the money to be doing my hair all the time....
Also find unless I condition like mad my hair looks in awful condition
Therefore HAVE to wash hair daily as conditioner makes it a bizarre mix of greasy/dry, no chance to be lazy or slack off!
I have also tried highlights but again found within weeks I had that brassy colour again
Sorry to waffle on - I guess my point is:
Dye or highlight if you want but this will have to be very regular and I'd go to a GOOD hairdresser to try to avoid the brassy blonde look - I can't afford to but would it I could
PErhaps you won't be surprised to hear I am growing out my colour and embracing my grey