this is what i think:
F-16 block 60
this would seem a good choice bcoz the RSAF already has F-16s so
maintaining the plane would be cheaper..AMRAAMs most probably would
be part of the deal
Rafale
i heard the RSAF prefers the rafale
good but quite small,
if they chose the rafae,i think they would buy about 30-40
if im not mistaken,the rafale can carry AMRAAMs too
EF2K
probably the most advanced a/c out of the lot
too expensive...i dont think they will choose the EF
Su-30
Never,Singapore will never want to buy russian jets...only
western
even though the su-30 is really good
F-15
very capable a/c, but the US will not give the full version...look
at
F-15I/S/K
superhornet
i dont think they will get it bcoz msia is also getting it
conclusion
the F-16,F-15 and Rafale have the highest posibility
russian-out of the question
I predict they will get the F-16 or F-15