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Hello leeway,
eyestrain is due to the use of TFTscreens, e.g. computer screens. E-ink displays won't strain your eyes as they are not loading the text constantly as TFT's do but only when you turn the page. This said it is quite easy to distinguish a device for your needs from any that you better not buy. Just have a look at the battery life and you will know which technologie is used.
For example Alurateks battery life is 24 hrs = constantly uploading the text = eyestrain. (even though there are folks that are happy with them)
Pocketbook, Sony, Kindle, BeBook, Cybook, and others have a battery life of 7,000 to 10,000 page turns = good for your eyes.
Sony has its own bookstore but you are not tied to buy there as was stated in this thread wrongly. You are able to buy books whereever you like to. There is a Sony device with Wi-Fi and 3G if you wanna buy on the run, it's the Sony PRS-950 Daily Edition.
Same is true for Kindle devices. They have their own bookstore but you are able to buy whereever you like to.
What you should consider beforehand is that there are two main bookformats: epub and mobi. While Kindle uses mobi Sony and the others use epub. Remember the two different videoformats in the 80ies? There was Betamax and VHS and you hat to make up your mind which one you wanted to use before buying a machine. Same applies here unless you learn to strip the DRMs.
To make a long story short: Actually you are free to buy whichever appeals to you mostly but have a close look at the battery life. It has to be stated in page turns to be the right thing for your eyes.
Hope this helps
Poppaea
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