Yes, got a feeling this has been discussed somewhere on here recently.
Most people take out the rear box substituting for a straight pipe or bend to the side. This will make only a very small difference to the noise and no difference to performance as you still have the horrid restrictive front silencer in place. Some go for a front box chop as you mention but this is quite noisy and the resonance inside the rear of the passenger area is enough to give you a headache!
I had this set-up on my pick-up and therefore didn't have any problem with resonance as there was no rear cabin area.
The best way I feel, without spending heaps of dosh on a stainless system is to swap to a single pipe system at the rear and substitute the restritive front box for a second rear box or one off a 90 or whatever. This will give you a far more efficient 'straight through' system which doesn't resonate into the cabin and sounds very nice.
There is a thread on here I replied to, about Disco exhausts, where I posted a sound clip of Shed my 3.5 efi RR fitted with the above style system and side exit.
Ah found it
http://forums.mud-club.com/viewtopic.php?t=47535 the clip is on page 2 if you're interested.
HTH