when installing /boot inside a lvm group, where do I install the boot loader?

Question

I am setting a personal file/cloud server based on ubuntu server 12.04 and owncloud but there are certain things about the partitioning that I can't get my head around...

Let's say for example I want to install ubuntu server 12.04 on my machine that has 500GB HDD. I would add 3TB HDDs as time goes on until ether the case or the motherboard doesn't allow me to add more HDDs and in that circumstance I would need to replace the 500GB HDD in which I originally installed the system. By using lvm I could move all the partitions to the other disks while I replace the 500GB HDD but I'm worried about the system not booting: if I install the boot loader on the disk itself, it will be lost when replacing the HDD and if I install the boot loader inside /boot (in the VG) I fear it would not boot or may still have problems when moving files and partitions around with lvm (which is something I need to do when replacing the HDD). I'm also worried about the name of the device conflicting on what I'm trying to do.

Is there a good way to work around this? maybe install everything inside the VG and when I replace the HDD then manually install the boot loader or any other way, I just want to be prepared for the time when I replace the HDD without compromising my data.

note: I'll be using GRUB2 and LVM2.

Thanks for the help!!!