HI MOna, I haven't done PGD either but am on the brink of going this path. For different reasons to you, however. I have just suffered my 4th heartbreaking m/c ( all AC cycles but not full IVF).
I know my FS will be pushing PGD but I am not jumping at this route quite yet as we have only had one baby proven to have genetic fault (trisomy 15). My decision will depend on findings from my most recent m/c
I did want to point out to you, that not all reccurrent IVF failures (or m/c's) are due to poor embies. The fact that you get blasties indicates your embies must be reasonable quality. have you thought of looking into immunological causes eg NK cells etc.
There is a very good DR at IVF Australia in Sydney whom I found out about through the lovely ladies on BB. he specialises in reccurent IVF implantation failures and m/c's. I know he is a long way away but he does do phone consultations. I am having one next week as I don't live in NSW either
Just a thought for another option for you. PGD certainly is expensive and like you, I don't want to go through all that if its not actually going to change the outcome. If your embies and my babies are "normal", then PGD would get us nowhere.