My primary goal was low distortion and secondary was a good balance of remaining characteristics. I went into this thinking It would be very affordable because everything will be much smaller, but I quickly discovered that this was no easy feat without nearly as much amplifier power as my big system to drive small speakers that cost way more than I had imagined. I found that I really liked the sound of Wilson Audio Tune Tots but after listening for a week at home the missing low end felt like the loss of a family member. What I finally ended up with wasn't the affordable system I thought it would be, but fortunately also wasn't the most expensive. I bought two Wilson Audio Watch Dog subwoofers and I am driving them with a Dan D'agostino Classic amplifier and the Tune Tots are being driven by Dan D'agostino M400 amps. The lesson I learned was the smaller the stereo system, the harder to achieve great sound without increasingly bigger dollars. Almost inversely proportional it seems like to me.
My best advice is to buy at least two subwoofers that are designed for music and not for movie LFE to go with your main speakers. Best of luck to you and try to enjoy the journey.