Holly molly, £5k for the warranty, that's insane, but it goes to show you that they expect it to fail so they have to make their money somewhere.
911's are awesome, just need to decide which model you like :D
I have a BMW with a warrenty, so I have used Jacksons a few times, and they are....... well better than they were before, but I'm certainly not a fan. I use Scott Taylors in Ramsey, and would be happy to recommend the garage for servicing.
A second hand M4 would be a great choice to go with a 911, sounds like a good mix. They are fairly cheap as they sold (and leased) loads so there is plenty of choice too.
I completely agree with this, I feel like I'm getting old as almos all modern cars just don't do anything for me. I'm not interested in how fast it is, their top speed, all the toys they have now, etc. I want to car that makes you feel special, most new cars I find so boring.