Alright so, i'm not sure where i stand on this thread, but my spider-senses tells me you are an obvious troll. Mostly backed by my impression of how you seemingly toss $1 million around like it's salad, yet you say things like this:
I could quit my job and chill in Miami and Ibiza for a year until I need money again.
Serious advice only please, I'm not fucking trolling
However, i'll give you the benefit of doubt and actually answer your questions to the best of my ability, just in case you're the real deal here.
1. Personally, i believe bitcoin could exceed your ambition of $1500/BTC easily next year. However, only time will tell. - There is an ever-pressing concern of political influence and potential bad news that could crush or limit bitcoin in the future. These facts should be of great concern when you're considering investing $1m
2. There are services out there who would take your offer seriously, and thus i propose you look for some more information regarding this. I'm not a specialist on investments of this magnitude, so i'd make sure i do proper research on this subject before even attempting to make contact with any site or third party.
3. Depending on where you want to spend your $million, there will be a long list of sell-orders waiting for you to purchase. If you were to use sites like Coinbase, Bitstamp or Mtgox, you'll have to expect the average price per bitcoin to be up to ~5% higher than the current price for those last few hundred bitcoins of your $1million purchase. An example: A few days ago i saw someone buy out 940BTC from Mtgox. This order ate up every sell-order from $1040 all the way up to $1070, thus driving the price up $30. I would consider buying in portions. Perhaps buy ~100BTC every hour for 10 hours or so?
4. You
should make sure the government knows of your investment whenever you plan on cashing out (if ever, of course) - avoiding capital gains tax of this magnitude is serious trouble. - It is also the right thing to do, as with any other legal investment.
A few last notes here. I would strongly recommend reading up on bitcoin some more. You seem like someone with an okay understanding of bitcoin, but i'm sure there is plenty you have let to discover and learn. Make sure you are confident in your investment before you decide to go on with this, and don't hesitate to ask questions on these forums, or other forums for that matter. - Personally, i would have perhaps waited for $1500-1600, as you say you intend, and then cash out for $1.1million (thus satisfying your deal with your father) - and keep the rest in bitcoin, if things still look good with the stance of bitcoin at the respective time.
I sincerely hope you are not some troll wasting our time, but i'll give you the benefit of the doubt and wish you good luck, and make sure you do your research!