Another really transparent rose (too transparent for me) is Prada Infusion de Rose. I like my roses to have more substance than that one has, but it may suit you.
Also, others have mentioned Annick Goutal Rose Absolue. This is wonderful stuff, a composite of 6 roses, similar to Highness Rose but brighter. It is more rose de mai than Bulgarian rose. I like the eau de parfum strength, but if you are looking for lighter and more transparent (with lower longevity though) they came out with a very light version 2 years ago, the "eau parfumée". The bottle has a bright pink ribbon and is only available in 100ml, where the edp strength of the same scent has a gold ribbon and gold lamé pouch, and is most often seen in 50 ml bottles.
Finally, although it is not what I'd call transparent, I have to mention Creed Fleur de Thé Rose Bulgare, my personal favorite rose fragrance. Very natural.
I keep editing with more thoughts. For people reading this thread who are looking for a soft and natural rose that is more affordable and easier to find than many on this thread, my daughter really likes one sold at Anthopologie called Happ & Stahns 1842 Rosa Alba. See Anthropologie website. It's nice enough-- not my idea of the perfect rose but it is nice.