I wouldn't even count on device names being the same all the time. I think an easier way to handle the device (than udev rules) is just use LVM. It uses physical volume uuid's to manage the devices, so you don't worry about what physical device it ends up as. You just reference the vg or lv it is associated with.
You could look at /sys/devices (possibly subdir pci*) to find out what it ends up being to the system, pci bus number or something, but that is a hassle too. If you don't need to explicitly deal with the device, just use it for filesystem access.
If you are sure a device no longer exists (like a hot swap drive that was removed) you can do something like this:
echo "1" > /sys/devices/pci0000:00/0000:00:12.0/host3/subsystem/devices/0:0:0:0/delete
(the above is on a fedora 13 system, Centos 5.5 is much easier)
You would use lsscsi to match scsi id to device name.
Then you could add the new drive, and rescan the bus if you want.
It would be much easier not to worry about it and use lvm.