Is your car under warranty Chopsdad?
If not, would you be confident to have a go at some of these jobs yourself?
Waterpump is a peice of cake with the cambelt DVD (presuming it's a V6)
It's nearly as easy on the 4 pots, but involves removing the cambelt (easy with so much working space in the engine bay)
It's out of warranty now James - that's why its all going wrong - they know you know!! :-/
I'll have a go at most things but wary of anything connected to the cambelt. Job done now anyway.
Track rod ends next....ho hum....then just new bearings, HBV and exhaust and it'll be like new. (No, these haven't gone yet but reading the posts it wont be long
)
For the exhaust, please, please go for GM. Tin sh!t from ATS / KwikFit is just plain awful.
I noticed a BIG differnce in MPG and exhaust noise with the new GM stuff on, got about 3 mpg increase. This was because the mid section had a massive hole, and I was loosing power. (can't afford that with 2.2's

)
I had cat back GM for mine fitted for £220 ish
Paid £200 for the zorst (TC), picked it up from Vx dealer.... got some odd looks by some family's looking at Zafria's! - Me walking out 3 times with massive chunks of exhaust.
Took it to my local mechanic, gave him £20 notes or maybe £30 now, can't rightly remember .... but he fitted it for me

- I did not get an invoice if you know what I mean, but an exhaust is an exhaust!

Btw no record of my HBV being changed, thought this was something that generally affected pre-facelifts?