Can someone explain the difference and mebbe post pics of standard struts and coilovers please?

Quite simple. The normal, stock set up on a 240Z IS a COIL-OVER set up. What that means is that the coil spring SURROUNDS the dampner (in this case a strut cartridge).

What most people refer to as COIL-OVERS are actually ADJUSTABLE COIL-OVERS in which the ride height of the vehicle can be adjusted by raising or lowering the location of the coil spring as it surrounds the dampner. This feature comes in handy when setting up a car for MAXIMUM handling under a variety of conditions / tracks, etc. It also allows for changing the spring to a harder or softer spring relatively quickly and easily. Most people would consider ADJUSTABLE coil-overs as overkill on a street car. Usually this type of set-up is only desirable for racing specific applications.

You can find pictures of coil-over set ups on websites for suspension companies like Suspension Techniques, Ground Control, or others.

so for joe shmoe daily driver guy like myself a coilover setup really isnt necesarry. I wouldnt mind decent handling but I really like the way it rides on the freeway as it is.

thanks for the timely reply