$430 is a great price for a pair of 685s. The 685 are pretty great overall and pretty much universally well-regarded. The 685 were my first "good" pair of speakers and I don't really have much bad to say about them...perhaps they lack some refinement and detail, but excellent in the price range. I guess it would depend on what kind of sound you're looking for, and only you can determine if they'll make you happy. Eventually the upgrade bug bites all of us in this hobby, but for now I would focus on getting a good sub rather than shelling out for different speakers.
ht Panasonic TC-P60ZT60, Monitor Audio: Silver RX6, RX Centre, Radius 90HD; Martinlogan Dynamo 700, Marantz SR5006, PS3, Oppo BDP-103D
2ch Marantz PM8004, Sony BDP-S1000ES, JVC T-X3 tuner, Monitor Audio Silver RX1, REL T3, Apple TV, Peachtree Audio DAC•iT
lr Panasonic 50ST60, Sony BDP-S5100