I would suggest to you to take a look at the summary made by our distinguished user GIPSY (might be old, but is a good one...do not know if there was an update)

http://www.qatarliving.com/node/467176?page=1

Once read make your own choice or have your own ideas!

And by the way next time do a search before posting...that has proven to be useful many many times...

Regards!!