There goes the obligatory information:
Wii Mini should never be considered as an option. It's an AWFUL version of the system with everything that wasn't vital was taken out.
No Online, no SD Card support, no Component / 480P support, only one USB Port and no GC Controller/Memory Card/Game support.
Basically, it gave you the ability to play only Wii retail games (no Virtual Console, no Wiiware) with the worst visual fidelity possible at a price that really wasn't worth it for anyone besides people wanting to experiment with it for console modding (and I mean, physically modding it, not software-wise) for whatever reason.
But besides that, you also have to be aware of another revision: Wii Family Edition.
To quickly difference between a normal Wii and a Wii Family Edition, if you can't check the console in person yourself and you only can do so with photos (in case you're buying it online) you only have to check the Wii Logo on the front of the system. If the logo is positioned in a way that the console needs to stand vertically, that one has GameCube support. If the logo is put to be seen horizontally, it lacks GameCube support.
That's really the only difference between normal and Family Edition systems. Another attempt to reduce costs of production.
Your best shot would be to try to buy a Wii from 2010/2011 with the vertical Logo if possible (yes, they exist), but with recent homebrew improvements to fix the 480P thing, it may be less necessary (yet those later models heat up less and consume much less electricity still).
Lastly, the "insects inside the console" thing applies to other systems as well. I've seen several PS3 and 360 filled with them. Not only is disgusting, but even if you clean them up, the system may be damaged anyway because of them crapping all over the boards and components.
Wii in fact may be less prone to that because there's much less space to move inside and it has external power brick instead of an internal one, which is why insects go in, it's warm.
Funny enough, bugs in PlayStation systems have to be somewhat common for Sony to put a warning against it when sending your damaged console to them for repairs. Gamestop also had in its rule book to refuse to accept items with insects in them because of how often it happened. People even brought game cases infested with them.
I still can't imagine how could that happen if you take minimal care of what you own, I've never experienced that in any of my consoles, although of course, depends on where it happens.
That said, bugs in electronics are gross, but the effect of smokers on electronics? That shit is eye opening and could be used to encourage dropping the habit.
