I understand exactly what you mean about not wanting a flat look overall, and wanting some more warmth and dimension so that you don't look washed out. I have lighter hair than you but still brown and I have the same issue. I'd love to add red but it turns orange on me and I definitely have a more yellow skin tone than you with quite a sprinkling of freckles.
I think the salon idea is a good one if you can find one you trust to know about color. If you color it and you like the color but it doesn't exactly seem to suit your skin tone, you might find that altering your makeup (like your blush) might do the trick.
You make me want to try red again.
I love red hair
I'm really interested to see the results - whatever you do. Please post back with a picture when you can.
2/c and some 3A. Modified CG.
Highly porous. Color over grey.
Best 1st day method: Super Soaker
Conditioners: Curl Junkie Beauticurls Strengthening Conditioner,
Deep condish: Curl Junkie Curl Rehab
Stylers: Experimenting with cones & sulfates while the dews are high. Sometimes try roller sets - classic glamor but I prefer my curls.
Every day is a gift