I use/like the Kindle Keyboard (no touch).
But the truth is, and I've thought a lot about this, they're all the same now. Well, not
all the same -- there's still plenty of difference between LCD and ePaper, more on that later -- but within each category, I personally feel that they've all copied each-other and homogenized to the point that it really doesn't matter which one you pick. Honestly. All the ePaper readers use the same pearl display, weigh more or less the same, and barring a millimeter or two, are the same thickness. Sure there's a couple choices to make, like physical keyboard, touch, or 3g, but the BRAND WARS are over. Well, again, not over... just moot since, we're now able to strip DRM and convert between B&N's Nook books and Amazon's Kindle Books, etc.
My advice is NOT to look at the specs or features -all the modern ePaper models are similar enough that the specs don't really matter. Instead, get one you like HOLDING. =) Go to your local electronics store and pick them up. FEEL them. I *
personally* like the feel of the Kindle Keyboard, because the extra length at the bottom elevates it in my hand. This feels right to me, and puts my thumb in the right place for turning pages. Others may not agree, and that's perfectly fine. I hear some like the new Nook Touch with its thick rim, and others hate it. Some can't see the smudges, others can't stand them. It's entirely up to you, and the only way you'll know how it's going to work for you is to get your hands on 'em

Oh, as for LCD vs ePaper, that's also personal and no stats or advice should sway your opinion, but don't get too caught up in the non-eReader features. Everyone keeps saying, "why would you want a $150 kindle when you can get a $200 kindle fire that does so much more. True, BUT it also weighs a ton more, has crappy battery life as readers go) and lcd screens bother *my* eyes when I stare at them for hours on end
Funny story: When I originally got into the eBook world, I got myself and my book-loving-girlfriend-at-the-time
Franklin eBookman 911's. They were basically large-screen Palm Pilots with the advantage of having a EL back-lit B&W screen. I thought, "how awesome that I can run apps AND read books!" ... I was wrong. The contrast was horrible, eBooks were hard to find and poorly formatted if did, the conversion tools (mainly provided by MobiPocket) were crap, the battery life was miserable, it took forever to transfer files to it, and when it died you lost everything! I tried hard to love the thing, but it consistently let me down. Looking back, well, we've come a looooong way.
Well, that my 5 cents. All just opinion, please don't take any of it personally. :p