I am on my second Zed, my first was a GT 280bhp and the one I have now is a non-gt 313bhp with custom leather seats.
I have been all round the country looking at Zeds for months and I always said to myself I have to get another GT and it must be the 313bhp model, problem was I could not find any which were in the right condition. Finally a car turned up on my doorstep at a main dealer (4 miles away, I had been going over 100 miles!!) and it was in my fav colour the condition was too good to miss, millage was right but it was a non GT. After a lot of debating, I brought the car.
http://s283.photobucket.com/albums/kk28 ... 87/Ronnie/
Now I have the car I can say that the standard head unit is not too bad I dont miss the bose at all to be honest I really do think its over rated, dont miss cruise control either. I havent looked back since buying the car, for me condition was everything. I get the impression the GT pack is more important on the 280 and 300bhp models there seems to be more of those about when I was looking and they did not seem to hold their price as much, maybe because they are naturally older?
My advice? hang on for a 313bhp one in good nick, if its a GT its a bonus but not a deal breaker... this is just my 2p though only you know your own priorities.