Okay, it's pretty obvious most of us don't know a thing about the car market in Singapore. It is obviously not like the market in the US, because we pay around $15k for Lancers, Corollas, Sentras, etc., but in Singapore a Lancer/Sentra go for $35k and a Corolla goes for over $42k.
Out of the choices you've given us, I would choose between the Sentra and the Lancer. To be honest, I don't think one is more reliable than the other. The Lancer platform is actually very sound, and the car is very popular in Asia because of it. A lot of uninformed people here will tell you that Mitsubishi only makes crap cars, but the truth is actually a bit muddled. Some of their models have always been crap, some were great and now are crap, some have not been around long enough to decide, and some have always been great.
About two years back while car shopping, I test drove Lancers, Civics, Corollas, Sentras, Hyundais. I like the Corolla the best in terms of quality and looks; the Civic was next; I liked the Lancers looks but the interior was a little sparse, and the same could be said for the Sentra although its looks were less desirable; the Hyundai looked goofy, but the interior was on par with the Lancer and Sentra. Engine/Drivetrain-wise, the Corolla was the quickest/smoothest, the Civic was a close second, and the Lancer/Sentra were third. I thought the Lancer was a little peppier than both the Sentra and Hyundai.
With the Lancer or Sentra, you're not going to get a very eye-popping interior, but I think both cars are soundly constructed. And the Lancer has been around in Singapore for much longer than it has in the US, so you are probably more qualified to decide if the car has been reliable or not.
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