From experience in SQ
's 744, seat row number 38 is perhaps the best, as there is the lavatory behind you, yet there's some space left for you to recline, and not get 'disturbed' by the passenger behind you. It is in the 1st compartment of the economy class. The 744 economy class is typically divided into 3 compartments, the first being row 31-38, 39-48, 49-66. Do not go for row 66, as this is the very end of the 744, and I have had motion sickness in that very last row. Also, there's not enough air circulating around that seat. So avoid row 60 and above!
As for the 772s, try to have seat row between 31 and 40, as this is quite the middle of the aircraft, therefore less movements when turning on the ground (as it is the pivot point). The 772 economy class are usually divided into 2 compartments, row 31-47, 48-59. Avoid the last compartment.
For the 773 on the leg to MEL
, try to get seat row between 31 and 35, as this is the first compartment of the economy class. There aren't that many seats, and it is preferable for night flights in that compartment. The 773s are divided, 31-35, 36-48, 49-61. Avoid the last compartment!
This is based on my experience, I don't know what others would say to this, but I fly SQ
all the time, so i know roughly what's good and what's not too good there. Hope it helps.
EDIT: Try to use SQ's Internet Check-In if possible. It allows you to choose your seat in the aircraft (subject to availability of empty seats)
[Edited 2004-10-13 05:40:40]