Probably better to ask your dentist, as he'll be able to give you a full evaluation of whether the teeth are worth saving or not.
It also depends on where exactly the teeth are. I remember my back tooth on my upper jaw causing me discomfort a while ago and the dentist advised me to have it removed. I prefer to try and keep what I can, so I asked if it was really that bad and was it worthwhile trying to save it. When he told me that there was no tooth below it on the lower jaw and it wasn't biting down on anything apart from the gum, it was a no-brainer .... I had it removed.
Bottom line is, I'd talk to your dentist and it all depends on how much discomfort they're causing you.
How are you getting along with the implants by the way??