Take the items one at a time
1. Sun roof - probably £500 for a correctly fitted one atht won't leak
2. Sat Nav - hate to think how much to upgrade to a built in one, probably another £500
3. Blue tooth - should be in any upgrade sat nav unit
4. USB Connections - talk to an electrician but again they may come as part of the ugrade audio/bluetooth/satnav
5, Leather Seats - £1500
6. Parking Sensors - £300
7. LED lights - to fit fully legal lights (including headlights) will cost well over £1000.
Total for that little lot is getting on for £4000.
As suggested above find the right car.
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