I saw many website which shows hotel at high prices but Booking.com is one of the best site I have ever seen. It shows best hotels at affordable prices.
They have also options for Direct Pay to hotel. Only you have to click on reserve, your hotel will be booked at the same time. If you are booking hotel everytime, you can go with refer and earn policy. You have to only invite your friend to book his/her hotel with Booking.com, After booking you both get discount on your next booking.