I don't believe you're going to find any high production bows in the weight range you want, so your options are to buy used or to buy a riser and have limbs custom built as you move up in weight. Buying new is going to be expensive, once you get past the first set of limbs.
Buying used, however, other people's loss may be your gain. With most people wanting to go down in weight, it is often possible to find good deals in the 60# and over range, although you rarely see bows for sale in the 90# and over range, so that might take a while. I think the most cost effective way you could accomplish your objective would be to trade from bow to bow, as you increase your strength, rather than adding limbs to a riser you already have. Since you're buying used and selling used, you really shouldn't be out of pocket for more than the cost of one bow at any given time. Of course, if you really like a particular bow, you could hold on to it, if you wanted to, which would be a deviation from the plan you could decide on at the time.