I have an 8GB and am nowhere close running low on space... but I would get the additional 32GB. It's only $50 more, plus there are benchmarks that show it actually runs faster than the 16GB. Books take up very little space. I can't help on games since I didn't find much of value on the Google store. Maps take up very little space. Looks like I can save the entirety of the SF Bay Area in 55 MB (0.055 GB) However, keep in mind that maps is literally a static map and a GPS marker - no searching whatsoever. If I had to do it now, I would definitely get the 32GB with 3G. When you're traveling, you don't want to hunt around for a free wifi connection (much less uncommon outside of the US) or pay ridiculous wifi fees to your hotel.