I researched all the standalones a couple months ago...HP, epson picturemate, Hi-Touch, and sony. For quality, dye sublimation is the best bet, sony or Hi-touch. I took a compact flash to a local store and printed the same picture on HP, picturemate, and the sony. By far the sony had the best all around picture. I have the ex-50 which does not have an LCD, but if you have a pict-bridge compatible camera there is really no need for the LCD, in my opinion. Either the pictures will be on a card in the camera or downloaded to a computer. Now there is the option to hook the sony printer up to a TV which gives you editing options, but I have not had the chance to do it yet. As far as cost, If you buy the bulk sony paper/cartrige, then it comes out to about 29 cents a prints, similar to most stores (walmart, kmart, target.) I wouldn't print volumes with it, but it definitely comes in handy for several prints at once.
I don't know where the heck you're getting a $0.29 per print figure with the Sony printer. Let's do the math. The 75-print bulk pack costs $39.99 retail at most stores. That's $0.53 per print, not $0.29. Unless of course you found that bulk pack for under $22 - point me in that direction because I'd like to know! Furthermore, I don't know about you, but as a photographer I think snap-off perforations are tacky. They leave jaggies all over the edges of the prints. The whole point behind printing at home is making it convenient to produce photos that look and feel like the real thing.
Epson PictureMate is the best overall bang for the buck and I'll tell you why:
1) Dye sub printers produce great, durable pictures but also have highest per-print costs among the standalone 4x6 printers. Sony, Kodak, Hi-Touch, and Canon all use dye-sub technology for their printing. You're looking at roughly $0.50-0.60 per print. The minlabs charge about half that for equal or better quality.
2) The PictureMate matches average photo lab print costs at $0.30 per print. You buy the paper and the ink in a package for $30 that gives you 100 prints. If you don't get all 100 prints, Epson has a guarantee that will refund you the difference plus postage.
3) Dye sub prints are durable, but they aren't very fade resistant. 4-12 years is the norm for a dye sub print. On Wilhelm Imaging Research's recent 4x6 printer longetivity test, the Sony model came out at the bottom (4 years). Would you honestly want that print to last only 4 years? The PictureMate's prints last 100+ years in the same condition (photo stored in a UV-shielded glass frame). The HP Photosmart 325/375 came in very close at 82 years (but this is assuming you use their Premium Plus paper, which costs $30 for 100 sheets - add in a $25 color cartridge and you're talking at LEAST $55 for 100 prints, assuming the cartridge lasts that long).
4) The PictureMate uses a 6-color pigment ink set, giving it a better color gamut than any of its competition (all others use 3 colors, with the exception of Sony, who uses 4). Since these inks are pigmented, you get the benefits of a long-lasting print (see #3 above) that is also water- and smudge-resistant just like a dye sub print. Again, you only had to pay half as much to get that!
5) The PictureMate is the most versatile 4x6 photo printer on the market. You can print from memory cards, straight from a PictBridge/USB Direct camera, from external Zip and CD-RW drives, from a PC, etc. You can even dump a memory card straight to an external storage device using the Save Photo feature.