Welcome to the redemption game.
So the first question I have is which Amex card did you sign up for there have been a few recently offering the 100K bonus. One was the QF ultimate (your points are now with QF, this card is excellent for QF points earn, hotels and overseas spend, I have one of these), the platinum charge (sweep card lots of options, good for restaurants, Amex lounge benefits, priority pass, Delta and fast track to elite status with multiple hotel chains and overseas spend but very expensive annual fee, yep have one of the as well) and one other the explorer?? Not sure on this one I think it is a sweep card excluding QF so I had no interest.
So why do I ask this question? It may help to achieve your goal. Sweep cards allow you to move points to other carriers which may present better options and after a little more research you may find it it better to create an off shore FF program and move points (sweep) to them. There are program that allow unristricted point purchase, but unless these have a good buy and possibly bonus points can be expensive.
I do not profess to be an expert (Jr member of this forum) but have spent a number of years in various FF programs, looking at some of the contributors to you thread you are already getting years worth of hard earned travelling advice. So what next, you are planning a trip in May 18, correct? Spend the next 3-4 months doing some research and asking questions not just on this forum but others such as flyertalk, AusBt, pointshack ect (sorry AFF) to learn as much as possible. In May 17 redemptions will start appear.
Without not trying to burst you bubble, unfortunately 140K worth of FF points doesn't get you very far without a larger cash outlay and status.
Last point research the the advice being offered, some contributors have a wealth of knowledge on OW, *A et.al and some on all. I would take advice offered by plane spotters, NB and PS with a grain of salt, and pay more attention to that offered from higher tier fliers (WP equivalent) and other life time travelers such as LTG or *A equivalent and learn from their insights.