When buying speakers you do need to listen whenever possible. As I mentioned earlier I have the Opera Callus speakers that have the SEAS magnesium cones. They are similar in size and look to the JA Pulsars and I loved the sound of the Callus speaker.
I have always liked the sound of the Harbeth speaker as well and earlier this year I found a used pair of Harbeth SHL5 on USAMart for a very good price and purchased them. I listened to both speakers side by side in my listening room for many days and to my ear the Harbeth was a little bit better. I could very easily live with either speaker.
To me the best part is looking for the next piece of equipment. Good luck!