the GT pack included:
Rays alloys 18"
Full electric, heated leather seats
Cruise control
Full bose 6 speaker sound system
My advise would be by the best car you can find in the best condition with the lowest miles possible for the cash you have. lots of people with the GT's change out alot of the parts.
-The wheels are fairly easy to source as people seem to sell them when upgrading (you could save the hassle and just upgrade to aftermarkets)
-Seats can be recovered for about £450 and you can choose your own leather and any embossing, embroiding piping colors etc, all your miss is the heated seat bit, and i'm sure that could be added.
-cruise control is good, but if you have a car in good nick then its a small luxury to loose.
-sound system alot of people with the bose unit actually swap it out for aftermarket units, as they sometimes suffer with the odd problem. you could get your self a very decent aftermarket unit and new speakers at a good price and possibly have a better sounding system.
just depends on what you want. try 2 versions and see what you really want