So after much thinking, I realized that the double-bling look (diamond band on engagement ring and diamond wedding band) was a bit too much for me. I had 100 days to return my diamond band to the store, so I did that after 2 weeks of "sleeping on it."
Had a bit of drama when trying to find a plain white gold band because they didn't have anything in the store that I liked and the lady thought I was nuts. I just knew what I wanted. A 2mm white gold band that is the same thickness (height wise, how it stands off the finger) as my engagement ring.
I ended up not buying from them but instead getting it custom cast by a custom jeweler nearby. It was perfect first shot. I probably spent all of 10 minutes in their store total for both trips-- the one to commission the piece and the other to pick it up.
It's perfect! I love it! And it doesn't hurt that it was $1,400 less than the diamond band

I think it sets off the engagement ring perfectly

p.s. ignore the ugly fingernails. I got a manicure minutes after I took this picture. -oops!-