1. Payments - Since you mentioned an allowance, I'm assuming that you want to know about monthly payments (EMI's). Obviously, EMI's depend on the loan amount and tenure and these can be adjusted to fit your budget.

2. Dealers -

Toyota - http://www.toyotaqatar.com/

Mitsubishi - http://www.mitsubishi-motors.com.qa/

Nissan - http://www.nissanqatar.com/

3. Though you have not asked, I would recommend Toyota as it has a better resale value than others.

4. Welcome to Qatar.