When you are a card maker it is really important to have a good selection of sentiments and birthday cards are probably the most made used and sold. So there is one stamp set from Stampin Up which I would highly recommend as there are so many different combinations that you can make.
The set Endless Birthday Wishes contains 27 individual photopolymer stamps for only £14 and includes large & small font as well as a birthday cake stamp and some lovely random spots. This has become my go to sentiment set .
Here is a quick example using celebrate and your birthday. To see the full set and purchase go to the Stampin Up website and choose me Jane Allmark as your demonstrator.