Hi, for such budget, I would recommend you purchase 2011-12 iMac, yes, it is old but it last pretty well, and it can run windows 10 nicely once you add the ram to 16GB and SSD (quite cheap now aday)

Why 2011? Because this “thicker” imac can upgrade ram and SSD pretty easy, the screen glass is magnet, just remove it carefully and unscrew the LCD, you can upgrade the SSD, or ask the shop do for you.

It price RM700 - 900 depend on if you ask them upgrade SSD/RAM.

It is 4-Core i5 or i7, and a discrete graphic card (6750 or 6770M) , the screen is bright and big, very suitable for office task. Infact, our office has 3 of this, run pretty well and responsive.

You can install windows 10 thru bootcamp (built in), and run some 2010-2016 games very well.

The internal speaker is very loud and bassy, and most important the all in one is saving lot of space.

I don’t recommend you to buy laptop at such age, as their battery should be need to replace already, especially Macbook Air, it can be costly.