Boy, how far can you travel a month?
RM2500 of petrol can last u at least 10000km.
Divide that by 30 days, an average of 330km per day.

Which if you still have no idea. Is equivalent to driving from KL-Penang.

But for the sake of your safety, literally. Don't buy BMW, cos it's one of the favorite of robbers & hijackers.

Get something less popular, like:
Alfa Romeo GT Coupe
Benz SLK 280
Audi TTS
Porsche Cayman S

These cars are going to be problem free as long as you serviced them as per schedule at authorised service centre.
Cost of maintenance?
It's peanuts compared to the car price.
Surely you can afford.