The advice of previous posters seems right on target about MGV. While I have owned an MGV resale 2 br unit for less than a year, I can attest to what the TUG posters are saying. You will be surprised at the trading possiblities. Why? Beacuse of the Marriott brand and the 400,000 members of the MVCI.
With a high MVCI owner satisfaction rate your Orlando unit will be sought after by other MVCI owners wishing to vacation there. Marriott owners tend to trade for other Marriott property. Hence, even in an over saturated market Marriott units trade well.
Another advantage of MGV is the lockoff feature. It will give you two vacation weeks in the same year. For a small charge you can deposit and then trade back into MGV through II and end up with consecutive weeks and possibly a larger unit. I think during flexchange you can get a one or two bedroom unit in exchange for the studio. MGV offers a lot of possibilities if you are flexible. However, the best advice that has been given here is to buy where you want to vacation. Trading units and points are secondary.