Your first option is likely to be redeeming Delta miles
for awards on Singapore Airlines.
Your second option (though the destinations will be a little more limited) will be to use your Continental miles for an award on Northwest. (Using awards for CO metal are tough, and NW has more of a network in Asia). Here is a
good site for checking NW award availability.
The above site also works for checking KLM availability, which will satisfy your AMS longing.
Note, though, that it's a bit early to be booking much of Winter 2003/2004 travel. You can generally only book 330 days out.
Finally, while it's good to plan early, recognize that alot of award availability becomes open only as travel dates get closer.
There are some seats that open up right away, and more that come online later.
This may get frustrating, because what you're looking for (SQ awards, CO miles for awards to Asia) aren't the easiest thing in the world to come by.
The one thing that does make it much easier is that you're willing to fly in Coach. You're a much heartier person than I!
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More Room Throughout Coach: the Website of Free Miles and Free Markets