Do a search in a few areas on this forum for some ideas and answers.....plenty of past threads on custom rear bars, lift kits and lots of other changes you can make. Look under the Projects, Good Oil and Members Vehicles areas.
I'm not trying to fob you off, but there really is a wealth of ideas and info there and it will give you an opportunity to see just what can be done.....then all you need worry about is the costs:D
The "bars" issue you mentioned is probably removing the anti roll bars to get more flex and wheel travel etc but it will affect the vehicle's handling overall and some things need to be taken into account such as whether the car has ACE fitted. Exactly what you wish to use the car for has a bearing on what modifications to carry out.

