Apart from what I mentioned I'm really leaning towards a Satria 1.6, 1.8 SOHC
Just read about your budget of RM15k for purchase and repair. A Satria 1.6 SOHC is very much possible here. Why do I said so? Is because recently I've been on a car restoration project myself.
I obtained a year 1999 Saga Iswara 1.3 Aeroback during the end of year 2017. That car had a lot of problems with it where the car is basically scrap yard worthy. I've been repairing and restoring the car to its original state since I took it on my hands. Until today which is about a year and a half, I've spent RM6.1k on it and now it is working better than ever before. RM6.1k is inclusive of several major repairs and even minor maintenance costs like oil changes. Now the car is reliable and problem free where I can drive it to anywhere that I want without any worries.
With a budget of RM15k, I believe you can buy a Satria 1.6 for RM6k or so and still have RM9k remaining to fix it all up. With RM9k to fix and restore the car, you can do a lot of things especially if you do up several things at one go where you can save some labor costs. My own RM6.1k of restoration costs takes place within a year where I'm fixing this and that from time to time during year 2018.