Thanks for all the great suggestions. I would love to fly back and forth to London 4 or 5 times - but I really don't have the time and I don't think I can get the cheap fare if I don't stay a Sat. night...

It may be that SFO- JFK-NIR-SIN-SIN-NIR-SFO-JFK- SFO twice may be the way to go. I can get the JFK-SIN r/t for around 600$ in H class and upgrade (hopefully) the entire trip... and if I overnight SFO-JFK I can turn this trip around in 3 days and do it twice for 6-7 days and around 1500$ So, I think that's what I will do - I was told by the 1K desk that all I needed was a Sat night stay. Leave on Thursday on the red eye back on Sunday - I think...

Anyone want to come!???? ;-)