Go the bmw, handles better than either the merc or the audi, and
since when was audi ever in? It has always played second fiddle to
bm and merc... just think about this, in europe and in singapore,
the merc is a taxi... but the bmw is a police chase vehicle... that
says a lot. Though in its defence, the new audi A3 is a nice piece
of kit. My friend owns an A6 turbo diesel quattro, its all right,
but I still prefer my BM 5 series anytime, my parents own an E
class merc and it is like an armchair on wheels, that is what my ex
boss used to call his merc...
But it all depends on you, what you want in the car? Handling and
fun... bmw, comfy ride and a bit more prestige, the merc... you
want hefty servicing bills, the audi. It is a well known fact that
Audi has higher servicing costs cf the bm and the merc... though
you could not be wrong with the E46 BMW, styled very well, the new
BM's take some getting used to and this is coming from a BM fan...
go on get the bm and join bmw.sg forums
Just my two cents worth... 
