I configured my rMBP with 16GB of RAM and 256GB HD. Since I use various cloud services and a 64GB MicroSD for storage, I configured boot camp to give 192GB to Windows (for gaming) and 60GB to OSX. With the MicroSD, that would give 124GB to OSX. The unexpected downside of the 16GB of RAM is that the sleepimage file is now, of course, 16GB. That's a lot of space used, despite the fact that it's very rare that that much memory is ever actually in use. I suppose this is a good cautionary tale for anyone with a similar configuration who is thinking of giving OSX a small amount of storage.