Now that Amazon has released a remarkably full-featured Kindle Wifi model for just $139, the $50 price differential between that model and the $189 Kindle 3G places an elegant value-proposition accent on the Kindle’s wireless connectivity. If you think that either of these Kindles is worth $139 as an ereader, that just leaves this question:

Would you pay $50 one time, with no monthly fees or AT+T contracts, for wireless connectivity that would allow you to check email, scores, stocks, weather and any text-intensive website from just about anywhere for the rest of your life?

Well, I thought so. Click here to pre-order your $189 latest-generation wireless Kindle 3G with no monthly fees or contracts for shipment on August 27.

Importantly, from the perspective of those of us who might occasionally want to use the Kindle’s web browser, the new Kindle 3G model comes with:

• a faster, more navigation-friendly, vastly improved but still absolutely free web browser based on WebKit, the open-sourced Web browser engine that is also the basis for … wait for it … Apple’s Safari web browser;
• a new Article Mode feature within the updated web browser that, similar to Instapaper, simplifies most web pages to text-based content reading;
• an automatic toggle between 3G wireless and wi-fi connectivity that makes use of the best, fastest network available once you’ve synched it up with your home, office, or local coffee shop’s wi-fi interface;

 And the first two of these features also come on the new Kindle Wi-Fi.