Something simple http://www.hayneedle.com/product/livexhomebasics562flushmountbronze.cfm

http://www.hayneedle.com/product/vaxcel-lighting-apollo-c008-flush-mount-light.cfm

Something with some texture http://www.lampsplus.com/products/quoizel-monterey-mosaic-24-inch-wide-semiflush-ceiling-light__r2519.html

Check out both hayneedle and LampsPlus, they both have great customer service.

Probably something simple -- you'll miss the heads, though -- if you can only have one junction box, it's nice to be able to spread the light around...

Something simple would really draw attention to the other lights you have chosen. The key is to get something simple enough that would match both and not take away from their beauty!

[Trans Globe Lighting Transitional Flush Mount Ceiling Light[(https://www.houzz.com/products/trans-globe-lighting-transitional-flush-mount-ceiling-light-prvw-vr~26729893)

[Oxford 16" Flush Mount Light[(https://www.houzz.com/products/vaxcel-cc65016bn-oxford-16-flush-mount-brushed-nickel-prvw-vr~37295493)

[6" Metal Trim Ring, Brush Nickel, Brush Nickel,[(https://www.houzz.com/products/6-metal-trim-ring-brush-nickel-brush-nickel-prvw-vr~44881487)

I thought I'd put this option in here because there are so many different options, but I thought the Brushed nickel look would match both the current lights as well as the Chandelier that you're putting in.