When it comes to investing, there are 2 theories:
- buy and sell asap
- buy and hold, sell when u think the market is at its best.

personally, i think a combo of the 2 is ideal: buy and sell to make urself a small capital, but hold onto those you think will have the greatest return in the long run. Like investor 302 said, the best projects for that kind of investment is the kind that will attract tourists: dubai land, bawadi, etc. all of those gigantic projects which are bound to see people flock to them by the millions. That is also why i think it is a good idea to pick up units there from the secondary market. If you have the breath / money to hold onto them, buy off the secondary market and wait :-) you'll be happy when the completion date comes around and people are going nuts for them.