I LOVE my Autumn Leaves flourish stamps (the first one on the list below) and would love to add all of the others. I use them OFTEN! They have held up very well and are so flexible (as far as the ways in which you can combine and use them together). Good luck choosing.
I love my close to my heart flourishes, but for the beginning stamper, I have to say Autumn Leaves because they are quite a bit cheaper than the close to my heart. I think Walmart has them the cheapest. Also, the close to my heart ones have to be ordered. (don't know about you, but I'm an "instant gratification" kinda person!)
I love Inque Boutique they are inexpensive ($11.75 for 17 stamps) and if you are just starting you don't want to spend a lot of money until you know if you like it. They also have some great swirls in matching chipboard.
Here are some samples: