On the subject of chips becoming obsolete due to Wii firmware updates:
This is still possible. Not in a "Your chip is now worthless" way, but in the way of the PSP.
The PSP has newer games being released that don't work on older firmwares.
The current mod chips sit on the DVD drive and modify certain bits as they get sent through.
Imagine: Nintendo creates a new format for the copy-protected section on their discs. At the same time, they release a new firmware that will be able to read and confirm legitimacy of these new discs.
Nintendo, knowing what the Mod chips will try to do, sets up the copy protection data so that when it is sent through a mod chip, it generates a change in the bits that would not be made in a system without a mod chip. The new firmware then detects this, and knows there is a mod chip.
Most likely, your systems will not be rendered useless ever, just kept from using newer games/pirating newer games. And there's no knowing Nintendo will ever go to a method like this. In the past they've not really done much about piracy. They did update their DS firmwares to stop Passkeys from working. Perhaps the current Wii Modchips aren't too different from the Passkeys in that respect.
However, since this is a developer backend, and a physical mod, I'd expect Nintendo to take little to no action.
But I don't have a Wii, or any money.
I'm just going to collect and wait for now.
Edit: As for the Wiinja vs. CycloWiz thing.... I agree that the CycloWiz is getting alot of paid-publicity, but from the start the Wiinja has looked really unprofessional and shady and bad to me. They have their own site up now but everything still looks really bad to me. I wish they had some real diagrams and installation instructions. Maybe better pics of the actual chip. Half of what they've shown of the chip has had their logo photoshopped onto it.
In the end, though, what you should make your decision based off of is the Quicksolder vs. Wire solder. That's all.