Again, thanks for a spectacular DO. For me and Mrs, it was definitely worth the money, and will be hard to top. As everyone can probably notice from how smoothly everything went, this was not the first DO Tommy777 arranged - not even close.
For the next DO, I believe that a duration of one week (+weekends) would be about the maximum for us. I believe that this time constraint makes it impractical to do a RTW. Our budget would obviously depend on the programme itself.
In my opinion, we have Europe and North America already pretty well covered during SMDI and the previous DOs. It would also be a good idea to postpone visits to Boeing until they have the 787 in full production - maybe in 2011. We haven't, however, covered Asia at all yet.
I believe that a circle trip of visiting NRT and SIN, with possibly ICN and/or BKK added in, would be a great way to involve the most important Asian *A members. It would be nice to see, how the cabin attendant training of SQ compares with what we saw at LH, for example. Any of those airports could be the starting point, since they can both be easily reached from any part of the world. Good connecting fares would, of course, be very valuable. As always, everything depends entirely on the willingness of the airlines to participate. Australia, NZ and Americas are a bit too far to be part of the same DO, IMHO.
As far as the flights go... I don't think that we absolutely need to do a charter flight, at least when flying between the major hubs. After all, we only need the forward cabin(s) for the Flyertalk class.