The best one is "Happy birthday!" :)

messages. 1."God definitely made someone special when you were born. Your life has been a great blessing to those you encounter. Happy Birthday." 2. "I am glad that you were born, because otherwise I wouldn't have been blessed to know you. Happy Birthday" 3. "You are the coolest person I know who was born on this day. Happy Birthday!" 4. "Ecstatic Birthday! There... that's even better than a happy birthday." 5. "I hope you enjoy your birthday as much as I enjoy being around you. Have a great birthday." 6. "Even though you may get gifts today on your birthday, you are a gift to me every day. The gifts you get are just a way of people saying thanks. Happy Birthday." 7. "You are so amazing, I would celebrate your life more than once a year if I could. Come to think of it, I think we should all get a few birthdays a year." 8. "Wrinkles may tally up the years on our faces, but you will always be the same great person who was born years ago on this day. Happy Birthday." 9. "Wishing you a happy birthday and hoping for many more years of blessings and prosperity." 10. "Even as you grow older, you continue to remain in style. Happy Birthday to a true classic." http://musiclove.hubpages.com/hub/Birthday-Messages-Happy-Birthday-Card-Message-Greetings

''All the best my friend'' or you can say Happy Bday , but it's up to you :)

I think this is very nice: Happy Birthday, Many Happy Returns

Just say: happy birthday to you ......and I think it is enough