You got a very good pair of quality speakers at a very good price. Further you said you think they sound awesome - nothing wrong with that! Why are you second guessing yourself?
You also got a very good receiver, the SC-61, capable of driving more speakers when the time comes. So when you add a center and a sub, as you indicated you would, you are ready. And when you add these other two, I'll bet you'll be thinking a pair of surrounds also to complete a 5.1 system. Guess what, when this happens you already got them - the 685's. You can use them for surround duty and think about 683's in the front at that time.
In the meantime, keep enjoying what you already have. You are on your way to a great system
Marantz PM15S2 LE, Oppo BDP-103, Simaudio Moon 100D DAC
VPI Traveler V2 with an Ortofon Rondo Blue and Simaudio Moon 110LP, Technics SL-1400 with an Audio Technica AT-14sa and Pro-ject Phono Box S
Dynaudio Focus 260's, Rel T-1 and a Panasonic TC-P54S1.