I'll take your low side and say $350
...
But I mean seriously, the fact of the matter is that people are still going to have to *demand* bitcoins... it doesn't really matter if the supply cuts in half if there is no one wanting it because they think miners will stop all together.
Now I also understand that you could also argue that people really don't care and want to use it for a quick buck in speculation, but idk... I just see bitcoin running into too many problems... just my 2 cents.
edit: it is pretty funny how everyone just automatically assumes that it
has to increase because of the halving... not really that clear cut of a situation.