5 Raynors 2 Titans. Two more Raynors and a Titan on the ways still
Artibrarily selected, but the basic point is that the Raynor is a direct combat destroyer. If the Orions have mostly been retired, then the GTVA has no other option for when you've got to kill that target, fast, no screwups possible. They need Raynors if they want to have a force that can do that now that the Orions are gone.
The Titan is however a ship that mainly carries fighters but also can overwhelm smaller craft quickly with its forward armament, and is a capable of limited all-aspect self-defense. The GTVA already has a bunch of ships that fit that description; they're called Hecates. Sure, the Titan does it better, but the Hecates are still in their first decade or so of service and the GTVA does not have the ability to replace them rapidly.
Admittedly, the Hecate did prove to be something of a blunder in FS2 as it wasn't adequately able to defend itself against raiding enemy capital craft, but the Titan's torpedos give all-aspect defense somewhat better than the Hecate's TSlashes. Maybe it's enough. Maybe it's not. I'd have to set up versions of Argonautica and Proving Grounds with a Titan in place of the Aquitaine to begin finding out, but Forced Entry would seem to say it's enough.