while what you say about something better always being on the horizon, with new emerging tech and their undefined marketplace, that adage does not really apply. Right now is a saddle point for the market where it will likely evolve into a market with a much greater number of solid choices instead of the current market with a handful of devices which are actually useful. Even those are quite limited in their maturity for tasks beyond casual reading. For that they are greatly over priced. Or the market could spin out into an anecdote due to limitations of the displays (I doubt this will happen thanks goodness!!
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The idea of always something better really only holds for markets with a large number mature well designed devices. Laptops and MP3 players are areas where you really need to try and find a truly awful device so waiting has no point if the device is wanted/needed now. An ereading device is not a must have sort of device and the market is far from stabilized.
As an example I think we are beginning to see the emergence of a big backlash over the much wanted large format reader in the KDX. But is trending toward it being a rushed to market not fully gestated design, far from ready for market. Several here have already found some important problems with the ergonomics as well as some hardware concerns which require compromise.
OTH, most seem really pleased with the display over the K2...so maybe something was learned...eink displays might look to have poor contrast to many of us because their design is actually a poor one for small displays and a larger panel is much cleaner and easier for reading. Which is my point, this is still a mid-beta period for device design.
Waiting those 2-4 months could save as much as 50% on the cost of a reader that brings a more to the table. And for sure better devices if one waits a just tad longer.
Right now there is not a single ereading device which I find compelling in any way. Too many compromises. Price the same devices at $150 or less and it begins to be OK to look at a device which simply reads small format books. But $300+ even with the wireless of the Kindle is not worth it...except as a special treat if you have the cash and really love reading. I am just not in a hurry to reward the pushing of beta class devices anymore.
For me I am waiting on what will develop from the 3Qi displays and who knows what else might come along at the same time.