since your configuration is based on Grub "legacy", "Super Grub Disk"
should enable you to restore the grub configuration.
http://www.supergrubdisk.org/
Then SysrescueCD comes with all fanciness regarding system recuperation,
including of course raid and lvm tools. You can choose at boot time
between two kernels for i386 or and two for amd64, and hardware
recognition is usually very good.
http://www.sysresccd.org/Page_Principale
For hard drive low-level tools, there's nothing like UBCD, the website
layout is pretty bad, but the tool is good.
http://www.ultimatebootcd.com/