A 67
I suspect the intent was for you to slide the target into the square you hit in, as evidenced by the power's "default" resolution with only Shift 1.
However, strictly RAW, a case could be made for sliding the target into any square you left, so long as the slide does not exceed 1 square (per the December errata, which you mentioned being aware of). I hate to say it as an answer, but you probably need to ask your DM about how s/he will rule it.