What color should I go with this time??

I get my hair done once per year (twice if I am lucky). I like to get something that doesn't need a lot of touch ups. I do not like my natural drab brown hair that is starting to get stray gray hairs so I have to get color. I have been light blonde, golden blonde, light brown, med brown with caramel highlight and deep brunette. I have dark brown eyes and fair to medium skin. We are going to Los Cabos next month and want to look young and sexy (hence the moniker h0t_m0m, doesn't mean I am but that I WANT to be!). Here are some pics of some of the different colors on me. Keep in mind that I am getting an airbrush tan before we leave so my skin will be tanner. Also, I only like subtle highlights, nothing drastic!

The darkest I have been


The color that I seem to default to (notice the dark roots)


My hair is about this length now