My usual limit is at around 7 GB, and I delete the game as soon as I am done playing it to reclaim space. I also have 4-5 favorite games that are sitting permanently on my HD.
I found "It's not a world for Alyssa" here, before the +section got restricted. After seeing that there are regular updates and really enjoying the content I am currently a subscriber.
I used to play the games from the Shark's Lagoon. The graphics weren't great and sometimes you had to chase the right pixel to click in order to progress the game, but the storylines were quite good for their time.
I have played games (both AVNs and normal computer games) that I thoroughly enjoyed, despite the simple graphics, so I would say the story is more important to me.
Of course, if it is also combined with great graphics, all the better for me!