Fili, I've tried to stay out of the IVF with PGD conversation because I hate being a wet blanket, but PGD is not a magic bullet that will prevent a random chromosomal loss.
PGD works very well in a few specific, certain situations. If one of the parents is a known carrier of a chromosomal abnormality (like a translocation) or a genetically-linked disease (like cystic fibrosis), PGD is very good at finding that known abnormality in the embryos and therefore preventing those embryos from being transferred back to your uterus. When PGD is used to look for one specific thing, it works well.
But when PGD is used to screen embryos for trisomies, it only works roughly 50% of the time. The science is so new that researchers don't fully understand why this is (they suspect it has to do with embryo mosaicism), but the one thing research has shown is that when used to screen an embryo for any chromosomal error (as opposed to knowing exactly what chromosomal problem they're looking for), it gets the answer wrong almost half of the time. That means that half of the time, an embryo will be flagged as abnormal and discarded when in fact it is a perfectly normal, healthy embryo. The reverse is also true - half of the time it says an embryo is normal when in fact it is not, and miscarriages happen anyway.
We know that our second baby died because of trisomy 13, and when we first talked about IVF with our RE (we're doing IVF because we're infertile as well as recurrent miscarriers) we talked about PGD with him. It's a very expensive procedure (about $5000-$7000 here in the US). For me and DH, we decided that we would be willing to pay that price if the science was good, if the procedure had good results for our needs. But we were not willing to spend that kind of money on a procedure that gets it wrong half of the time. Given my age, we weren't willing to take a 50/50 chance that we were discarding normal embryos.
The decision is a very personal one, just please make sure you really dig into the science and ask LOTS of questions and get a second opinion before you go into it. I hate to see people think it will prevent trisomy miscarriages because at this point in time, it doesn't prevent them all.