Well, if you are searching for the clinic abroad I would definitely recommend you to go to Ukraine. The most prominent clinic there is of course the Biotexcom. I have undergone my treatment there (luckily, successfully, on second cycle), can't be more happier and have made so many friends that I am still in contact with
It's easier to choose the clinic when your friends have undergone treatment and have success with them. Most of my friends have been happy with IVF clinic in Gdansk (Poland), so it was easier for me to decide.