Originally Posted by weisserguy
...i like the front on the 4th gen much better than a 5th gen, and the back on the 5th gen much better than a 4th gen.
That is the general consensus, I believe. Most 4th and 5th gen owners have a little generation-envy for the others' taillights or headlights.
However, there is an easier way to get a 4th gen to look really cool from the back: Skyline R33 taillights!

:hitit:
Not exactly plug-and-play, you'd have to do some cutting on the trunk lid to make it fit, and then cut the stock lenses and paint them as a pseudo-panel to fill the space around the new taillights. But it's probably easier than swapping front ends.
The taillights themselves go for around $150 on eBay.
Dan