the 'traditional' PGD test, only tests a handful of chromosomes. CGH tests all 23 pairs of chromosomes. with the arrival of CGH, PGD is no longer efficient, even if you are able to do the test at a reduced cost, say 1 or 2K, it still will not give you a clear picture of an embryo's normalcy.
In our IF journey, we have in fact, done both testing as they have come to be available. I would advise against any testing that can not test ALL the chromosomes. the ranges of abnormalities that can come up in a group of embryos can be widely varied. for example, in one batch of say 10 embryos, you may actually have several or more abnormalities hit on different chromosomes.