It looks to me like you have enough suggestions to thoroughly confuse you, so I won't add another!

I love the variation in your blocks but I would have either cream or off white to make the colours pop. I feel either red or blue will over power it. Good luck.

i see red first, too. Have you thought about a neutral for the sashing, like cream or tan?

For me, I like a medium blue for the sashing and a red binding. For a border fabric, I suggest a medium/dark blue. You have so many great colors to draw from. I am sure it will turn out just fine. Great job. GiGi

how about black and white?

Count me in with the reds -- and can I tell you, that doesn't happen very often with me!