B14 sr18?? Just kidding lah...
If you looking for fun car then please go for JDM like proton, honda or toyota, 50k you can get perdana/putra/wira/satria + modded e3 engine, ef/eg + vtec, corolla/corona/mr2 + 3sge, still got spare money to touch up...
If you like continental sport car then can try fiat coupe 20v first batch, luxury car which is also my favourite will be bmw e36 or e39 96/97 or volvo s60... Bear in mind continental cost a bomb to replace part but very tahan won't easily broken... but if you able to get a very good condition one then can think about it