I agree with Steve wood sides would look much better. These look like a granite counter store's idea of built in counter speakers for a kitchen.
For my 1.7i s, I use a custom downfire Rythmik F12 servo drive sub. It seems to do quite well, but If budget permitted GR Research Double Trouble open baffle subs would be my go to. Dont know for sure, but probably more affordable then the Maggie sub.