If you're upgrading your rear link, I'd also say add the rear link guards. I have the Metaltech links, but severely beat up the link mount and am really wishing I'd installed the link guard in advance rather than having to try and bang these out and weld over a beat up mount.
That said, as [MENTION=130999]Inv4drZm[/MENTION] said, if you don't need the protection then aftermarket links probably aren't needed. No harm to them, certainly, but no need.