It is your choice which type of implant you want. As long as you understands the risks and benefits of each implant, it is your choice.
Assuming you have given a lot of thought to your decision, and fully understand the pros/cons associated with saline versus silicone gel breast implants, then I do not see why you should not be able to undergo the revisionary breast surgery you are considering. Again, make sure that you understand your plastic surgeon's rationale behind his recommendations; then, make your decisions carefully. It may be necessary to seek additional consultations with well experienced board certified plastic surgeons as well. Best wishes.