Finding a Good Typewriter

I want to get away from my computer more to do writing.  Having the internet in front of me can be very distracting (it can be a multi-hour black hold).  Moving away from a screen altogether helps clear the mind and focus on writing.

I want to find a good typewriter for a reasonable price that will readily have ink ribbons available.  I don't plan to do heavy amounts of typing, just write occasional poetry and maybe some screenplay scenes/ideas.  I might also use it to address envelopes professionally.

When looking for good products currently available, I head to Amazon to find the best sellers in the relevant category.  Here's the list of the best selling Typewriter products.

I've narrowed down my Typewriter purchase to one of these two models.  By spending an extra $22, I get a large built-in dictionary, and can have a few more features included (like bold printing)

Brother GX-6750 Daisy Wheel Electronic Typewriter
$81.62 on Amazon
$120 retail price

3.8 out of 5 stars on Amazon, 196 reviews
Date first available at Amazon.com: August 8, 2000

specs:
includes a ribbon
weighs 10 pounds

Brother SX-4000 Electronic Typewriter
$103.96 on Amazon
$280 retail price

4.1 out of 5 stars on Amazon, 183 reviews
Date first available at Amazon.com: April 23, 2002

specs:
* 70,000 word dictionary
* 16-character LCD display
* bold printing
* 7.9 pounds

Ink ribbons for both of these Brother Typewriters are the same model (Brother 1230).  It retails for $13.29 and Amazon sells them for $7.74.  It yields 50,000 characters per ribbon.  The average English word is just over 5 characters, so a ribbon would last for about 10,000 words.  This article details the length of books of various genres. And another article from WritersDigest.com on book length recommendations for authors.