This is my engagement ring:
http://www.bluenile.com/product_details.asp?oid=5410&page=1&col=1&row=5&po s=13&set_shape=

It is set with a high-quality one-carat stone. One concern is that the prongs on the side of the engagement ring extend to the base of the ring, and a straight band doesn't set flush against the band of the engagement ring. What do you recommend? Any links or pictures will be appreciated.

I had one made to fit mine and surprisingly, it's wasn't expensive at all. They will take a mold of your ring and make one that flushes next to your ring perfectly.

I think when you have a ring with so much details on it already you should go with a plain band just to keep the attention on the engagement ring. Congrats

There are bands which have a little dip in the front, some have a curve, some have a full "v" shape (chevron).
This is just to show you a shape, I think you should just have plain gold to go with your solitaire, though -
http://www.jcpenney.com/jcp/Products.aspx?DeptID=0&CatID=031145&Grptyp=PRD&Ite mId=1200ecb&cmRef=http://www.jcpenney.com/products/C035273.jsp

I'm in a similar situation. a straigth band sit flush with my ring either. I have been looking around at different stores. They make rings that are curved and alllow the band to sit more flush with the gallery of the ring. that would be you best bet. Thats what I will end up getting. Good luck finding your ring!!!