I think that's an great idea!  If you have the room, go for the largest implants you can.  My dear Trans friend recently went from 800 to 925cc and she looks great and is extremely happy with the bump-up in size.  At 800cc, you're starting to get into the larger titty sizes, and I believe that you're like me and would like to have your breasts be as large as possible, so IMO, go for it!  I think the only regret that you'd have is if you didn't go as large as you'd like to. 

My own plans for augmentation got a little off course, but hopefully are now back on track with a new PS.  We've discussed and he agrees that we're going to go with the largest silicone implants that he can possibly fit, which will be at least 750cc, and hopefully 900+cc.

Please feel free to PM if you want to chat more.  

Best regards,
ChuckM