I can't really comment on anything but the styling.
Finally someone I can agree with I've never liked the sedan R-series cars, but at least the R34 sedan gets the benefit of the harder styling of the 34 line. With enough money ploughed in to it, it can even look quite good (as others mentioned, see Numoken/URAS).
The Chaser I have just never liked. To me it represents the peak Japtastic 90s styling. No amount of fiddling and aftermarket parts help: it just looks like a desperate attempt to inject some excitement in to an otherwise extremely boring design. The Chaser in the first post looks like a dog to me. The one posted by ABuSD is the best one I have seen, but its stills says "tarted up Camry styling" to me. Sorry
Lucien.