Property Management Software

I am a computer hardware vendor with few hotel clients. Many of my clients are in need of some hotel software and often ask me to find one. Its a tedious process to research any software and install in the hotels, but in order to entertain my clients I have to do that.

So I am looking for a hotel software which is good and easy to use. Besides that it might be better if I can get some commisions on reselling the software, so that my efforts gets paid off.

Does any one has any idea about which is the best software for small and medium sized properties with a budget of 500-2000$.

Please let me know your views. It can save me a lot of hours of research and may be some expert advice can help me make better choice.

Thanks