I've always been a fan of Totem speakers and would recommend checking out their options. In particular, a pair of Arros would make excellent fronts which you could later combine with a set of Dreamcatchers or Mites and a Storm sub to make a full 5.1 system. Arros routinely come up used on Audiogon for around $700-800. If you can stretch your budget a bit more, a pair of used Hawks for you fronts would be even better.