Currently a large portion of my buy orders are in the 375-425 range, but think these will only be hit if some serious bad news will spark large sell-offs. I think this is a plausible scenario, but also believe that it won't take long until the bull-market starts taking over again and this low-range becomes unlikely.

In consider low 500s highly likely though, based on the current sentiment, events (Gox) and historical movements - perhaps already upcoming week.