I already answered but I think you should have made a $0 option.  I'm sad to say this but there is probably about a 30% or so chance that within 2 years something will happen to make bitcoins worthless.  I hope it doesn't happen but the possibility is always there that something will happen such as the cryptography being broken or the governments all coming together to outlaw them or otherwise make them extremely unappealing to the point where they are worth under a penny.

But as I said if bitcoins stick around without something catastrophic happening I think somewhere around $200 per BTC is likely.