The Anubis is worth having with the max level you can achieve playing the campaign. You want to keep the shields from your old ship, though...
I got a Kusari Dragon late on my second play-through and photon weapons. The rate of fire was obscene and they cut through most things in nothing flat. Unfortunately they're not so good against the aliens...so it was back to neutrons on the Anubis.
From the Anubis, I kept going in single player for awhile after the campaign ended, got the best ship money can by, the Corsair M10 Titan, and enough of the Level 10 weapons to completely fill out its slots. Six forward Level 10 guns...if only I could have had that for the campaign. I would have loved to go up against some Rheinland cruisers with that.