Dear me m8, you have got a bit of expense looming. I have recently done both front wishbones and rear springs the total cost for parts being about 200 notes.
The wishbones were 58.00 each and the springs around 27.00 each.
Wishbones fairly straightforward and relatively easy to do the only difficulty being the hidden bolt heads of the rear mounting. It is too easy to drop the bolt inside the chassis and lose it. I opted to buy a couple of spares just to be safe. Remember to only tighten them as per the instructions or they will not last!
Rear springs are easy enough if you buy, borrow or hire a set of coil spring compressers. I took off the rear shocker mountings to aid access and by using a bit of leverage and using the spring compressers to their maximum I did not have to drop the diff.
When you are done I would have it tracked and all four wheels re-aligned too. WIM's are the BEST!
Ebays vauxhallpartswarehouse
(
http://stores.shop.ebay.co.uk/VAUXHALL-PARTS-WAREHOUSE__W0QQ_armrsZ1)
is pretty good for prices and the wishbones I got came in the same bag as my mates did from the local VX dealership.
The springs I got from a local factor but were also in boxes marked with the GM logo.
They have all been on now for getting on two years and show no signs of wear seeing as they have flown through the test again. The roads around here are very badly maintained too with loads of potholes and I ain't a slow driver.
GudLuk