I think every HF Ranger fan had Cherapanov penciled in on the first line but for obvious and unfortunate reasons I believe he doesn't qualify for this discussion.
For me personally, it's Grachev, and not necessarily because of his "top end" ceiling. I thought his realistic, achievable, ceiling was a Nik Antropov type and his basement was an Evgeny Artyukhin. Obviously, that didn't come to fruition, hopefully Fogarty becomes an NHL'er.