eInk screens are opaque, and hence can't be backlit, so if you specifically require a backlight, that rules out eInk, and you're looking at tablets, such as the Kindle Fire, or the various tablets made by Nook, Kobo, etc, or of course generic Android tablets - Nexus, Samsung, and so on.
I would, however, recommend that you drop your backlight requirements and consider eInk. eInk makes for a much better reading experience than LCD devices (more comfortable screen to read, enormously longer battery life, and so on). You're best off sticking with a device from a known manufacturer, rather than an unknown such as Pixelar. You basically have two choices:
1. Amazon Kindle (various models). This gives you access to the superb Amazon bookstore, and Amazon have unrivalled customer server. However, they use a different eBook format to other manufacturers. This isn't a problem - formats are easy to convert - but if you have a large investment in ePub books, it may be a consideration.
2. Nook, Kobo, etc. All use the industry-standard ePub format. Doesn't give you access to any more books, but makes it easier to move books between devices.
Personally I'd recommend a Kindle, if you can drop the backlight requirement.