I would add a border. It is a lovely quilt top. I see a lot of blues in the blocks so a blue border would look nice.
You have lot of color choices for a border. You may go with one that brings out a color in the room it will be in.

I'm a border person. Every quilt I've ever made looks more finished and professional with at least one border. It's like framing a painting to me.

I think a border or two with a chosen color from the quilt would be nice.

I would add a border also. I love how your eye can be drawn either to the circles, or the stars.

I see I'm outnumbered here... but... I vote for no border, just dark binding. Have you seen the book, "Skip the Borders"? It is great for showing which patterns look best with or without a border. This IMHO is definitely a borderless quilt. The pattern stands on its own and I think anything but binding would detract from it. Why not lay it out on your bed and lay some fabric strips under the edge, walk away then back and see which look you like best. Its a great quilt. You should be proud. I hope you'll post it again when its done.

I vote for a piano key border. That would focus you eye on the beautiful center of the quilt.

It's a beautiful piece. I would do a large, small, large border out of the colors used if I had enough. If not a solid color would look great.

I would do a white border then bind in a deep colour. Beautiful design it will be a pretty quilt whatever you decide.

I'd definitely do a border, especially with this pattern - maybe a darker color. Love QuiltnNan's idea of the piano border finish with all the fabrics you used for the center...that would really be striking on this lovely quilt top. If you wanted, you could make it a wider piano border and then scallop it, because of all the 'rounded' areas of the quilt top, that would be a terrific finish.

oh what a beauty! I am very partial to a Quilt with Border, so I will say Big "yes" Add a border! Any color will do! If you can find a batik or speckle fabric, it will add beauty to your quilt. Good Luck!