Don't know anything about Nokia's build quality besides the n800 (well I have a Nokia 5130 ExpressMusic now and nothing wrong with .. besides a few odd UI decisions though). Girlfriend's 5130, had two problems (something wrong with the speaker on the second one since it would be extremely fuzzy and the first one just stopped working for some reason the day after we got them).

Though I've dropped my n800 so many times now (sorry buddy it wasn't intentionally) and the only thing it has to show for it is scratches on its bezel and sides.