You're a visionary, and I'm so glad reading you rise the gravity issue. When it comes to it, this consideration and the whole extraterrestrial direction-setting exercise, as simple and rational I expect it to go when I speak with others or read their comments, become instead a maturity test I'm waiting for in people willing to take it, and sadly I rarely notice anyone passing it. Another related thought I've had the joy seeing echoed in this discussion thread was the first sentence of this comment: https://news.ycombinator.com/item?id=24574145

Mars is a rock useful for many things, no doubt, but not for humans to live on. As challenging as it seem right now, Venus' problems are solvable, and it just happens to offer the necessary conditions for humans to live on and avoid speciation. If this kind of terrestrial gravity was nowhere to be found but on a planet somewhere as distant as Pluto, we'd still had to go for that (and be thankful for it to exist in our Solar system at all) instead of going for Mars-sized planet and orbit. It just fascinates me that it happens to be the closest us. Humanity will get there and will learn a lot from the process, which is nearly a must-have experience for any further much costlier colonization endeavor on another planetary system.