depending on what you mean by 'nice'...the following are ranges for some cars:

1) 1800-2000 per month gets you a 2011 Nissan Tiida/Honda City/Kia Rio/Honda Civic/Nissan Sunny

2) 2400-3000 per month gets you late model Honda Accord/Mazda 6/Toyota Camry/Nissan Altima

3) 4000 and above will get some unusual choices such as Hyundai Tiburon/Mitsubishi Eclipse/lower end SUVs

That being said; with your situation what with the decent salary and singledom, I would definitely get my own car. If you're ok with used cars, you will be amazed at what QR 40000-50000 can get you here. I say better a used but premium car than new but economy run about:-)

 

check out the Qatarsale website or Carsemsar dot com to get an idea of the car market here