HI Andrew,
If it was just the the boot drive and your lvm data store is onthe other drives you should be able to reinstall nix on a different drive boot from it then scan for other attached drives using lvdisplay create a mount point and mount the volumes.
or was there actual data you on the boot drive you wanted?
i've used these guys before on a a 2 failed drive raid 5 array on a HP DL320 running a database server they got it working and we where able to recover the mdf files clean out the corruption.
http://www.elcotronics.com.au/
raid recovery + copy was around 2k
i've had other use them all with sucesss in getting back about 95% of files at betwen 600-800