I got an 840 Pro two years ago, and its pretty close to full now (~20GB left). And I only put Arch and program binaries and data on it, ie, my documents, movies

I got an 840 Pro two years ago, and its pretty close to full now (~20GB left). And I only put Arch and program binaries and data on it, ie, my documents, movies music, source code, my pacman database, etc are all on my mechanical drive. At that, like 125GB is steam games. I would definitely need a terabyte SSD to try to consolidate a system all on one disk. My notebook right now is a 256GB SSD + 1TB mechanical that works well.