Thanks a lot guys for all your comments ! That's terrific !
After reading all you said, I think I will go for one of the US program.
Prefer to get all my miles on one card rather than splitting them.
I love to go simple... mind serenity is no price
Any other advice concerning US programs from *A for a guy living in BOS and booking flights for Paris, England, and CA ?
Extra information : Seems in 2012, OnePass (Continental) and MilesAge+ (United) will merge, so it seems a good program to join... is it a dumb idea ?
Thanks in advance !
Shymere