Where do you live? I can recommend Shaun/Sean Chong/cheung/choong (OK can't quite get teh name right) at Monash Ultrasound in Victoria. He works from Box Hill, Monash, and Richmond on different days of the week. He is an OB but Ultrasounds and associated procedures are all he does so very experienced.
I went to him for a CVS but he would not do it as position of baby meant it was risky so went back for an amnio and I did not feel a thing during the procedure or after.