When comparing these two items [Mantellian Smuggler's Tunic](http://www.torhead.com/item/a8HJjgf) and [Spec Ops Jacket](http://www.torhead.com/item/f1V5bKN), the only visible difference is 113 armor. Is it just me, or is there very little point in upgrading these, rather than just changing mods? Are they intended to act like heirlooms in WoW, or do they have level caps on mods?