AFAIK i cannot bet at least 500 when block halves, no idea.
i wouldn't speculate on the exact dates, but the way i see it it's bound to go over 500 by the end of this year, for me that's a safe bet and safe ~20% profit at the least.
even tho it's possible that there will be an another hype and tip over the 1k range once again; it all depends on the momentum it gets. "snowball roll"
Not many people are hoping for $1k again, but $500 seems to be a safe bet with the block reward halving around the corner. The problem is there has been a run up in the price over the past few months.