For security reasons I want change our front door lock to a "Lift And
Lock" type that locks when you lift the handle. Is that possible? Do I
need to change the whole lock?

Will I need to change the whole lock (i.e. top and bottom deadbolts)?
The locking mechansim? The spindle?

Can anyone recommend a reliable online retailer?

There are some pictures he http://photobucket.com/FullexLock

* Distance between screws - 215mm
* Distance between handle and cylinder - 68mm
* Distance between cylinder and edge of door - 35mm
* Two deadbolts in the frame as well as central deadlock

Thanks!