blaxer, in my experience (Zenarc 701tsv), the monitor itself isn't of low quality, it is (as you say) the sunlight readibility that is the major downfall. If you are able to mate the display to a device that will provide a native resolution it can lock on to, then it behaves as it should with regard to sharpness and clarity, it just can't handle glare. Outside of sunlight, I'd compare a native resolution front end on my 701 favorably from a sharpness and color reproduction standpoint to any of the Pioneer displays on the market currently...just not in sunlight. At night, I'd say my older monitor was better than what I've seen from Pioneer, etc. in a double-din dash unit.
It is therefore desirable, imho, for you to pursue any of the current lilliput transflectiv displays, but just make sure you research the particular model in question, purchasing a "known good" display adapter and monitor combo that is capable of displaying native resolution (if such exists, and I believe it does). I don't have a suggestion as to model numbers in that regard, but rest assured that this is what you're probably looking for.