Rio is 44k now. I guess you are not considering hatch?
Am thinking, maybe only Proton Wira about the price range. High a
bit, you have Hyundai Accent. But these are not fantastic cars
either.
Push your budget a little more higher, 50k. You will have much more
choices. Kia Cerato, Chervolet Aveo are much more popular names.
With Nissan Sunny, Toyota Vios, Suzuki Liana are not too far out of
range.
Here's the advice I give to first time car buyers all the time. If
you can't save about 1k a month, don't buy a car. If you can, save
up a few more Ks and to make a bigger down payment for a better
car. 6months=6000, budget raises to 50k. 1 year later, can get
Vios.
