BA mk II turbo suspension

[grn80]

Hey guys,
I've recently become the proud owner of a modified BA mk II turbo sedan.
The previous owner has fitted lowered springs, whiteline swaybars and on the front camber/castor adjusters.
the swaybars are 27mm on the front and 22mm on the rear.
the lowered springs have resulted in the following ride heights:
Front- 347mm (measured from centre of rim vertically to outside edge of guard)
Rear - 340mm (measured from centre of rim vertically to outside edge of guard)

After reading all I have been able to find about your products i'm keen to get a set of coil overs to suit my car. my questions are below:
1. how much for a set of the fully adjustable coilovers delivered to Acacia Ridge Qld 4110
2. I'm wanting to raise the back of the car to match the front. From what i've read by setting your coilovers to achieve a 345-347mm ride height all round I wouldn't be negatively affecting the handling of the car?(i'm not concerned with departure and approach angles just don't wish to affect the handling negatively)
3. what would be the effect of having the whiteline swaybars? should I keep them or would I need to switch back to standard XR6 swaybars

Q4: not falcon related. do you do coilovers for an s15 silvia and if so how much?

Cheers for any information you can provide.

Graeme