Quilting Decisions

I've finished machine quilting the mauve striped quilt top...

It's quite long, but I'd like it to be wider...
It's also a slightly irregular shape... Both ends are wider than the middle.

Should I attempt to trim it down?

What color border should I add?

The white brightens it up, but the purple blends in more with the mauve stripes...

There are always decisions to be made - until the quilt is done!