depends on your experience with displays and the price range your looking for. You can't go wrong with Matrix Orbital displays. I had a graphics one a while back and it was pretty nice. Plus LCDC is top notch. But the MO displays are higher than some of the others.
Parallel software is getting beter and cheaper than MO and cystal fontz. www.pc-lcd.co.uk ready made backlit parallel 4x20 lcds for around 30 pounds. Cant really argu with that price for a ready made one.
This is the best - http://forums.bit-tech.net/showthread.php?s=&threadid=12398 As for the best for value for money terms then I'd probably go for one of the small parallel's from farnell Rob.
Personally, I'm waiting for the new 20x4 usb lcds that Matrix Orbital will be releasing in the next week or so (or at least that's what Henry told me).