800cc Breast Implants with Breast Lift for Patient with Slight Ptosis?

800 cc implants are the largest ones available. They are quite large and may cause you to sag even more after surgery.

It sounds like you are quite unclear about your options and very uneducated on the consequences of having the biggest implants on the market placed in you.
IF you have sagging breasts, then you need a Lift.if you have need for more volume you would benefit from an augmentation.If you need both a lift and volume you would benefit from either a single procedure or a staged Lift / Breast Augmentation.
For the vast majority of women 800cc implants are a REALLY BAD idea. They will be associated with visible ripples, wasting of the breast glands, rapid sagging, and earlier deflation
Think it over.