Hey David,
Glad to see it all came together for you. Nice Work!
Good suggestions posted above. I think you will gain the biggest bang for the buck by playing with speaker placement and room treatments. You will also learn a great deal.
Start with a search for the Cardas Speaker Placement Method. It will give you geometry for placement to evaluate.
Play with room accoustics. You can hang heavy rugs or drapes temporarily to see the effect. Even canvas painting's will change the sound.
Congratulations and Happy Listening!
Jim S.