Of the Helgolands, the railgun version would be best though not ideal. Some additional speed, normally expensive, can be had almost for free: 5000 or 6000km/s with matching fire control means you can sacrifice 2-4 guns with no loss of point defence capability, and since "Speed is armour" you may also get away with reducing armour by a layer. It may be possible to make it a better ship simply by taking things away and getting a matching fire control.
Either of the revised missile cruisers are fine, as far as their armaments go.
The 25% launcher version almost perfectly matches reload rate and missile endurance, nice! Which will be preferable depends on doctrine. Potentially huge alpha strike vs. ability to reload from colliers, more ordnance carried and being less fiddly if you're happy with measured salvos. If you plan for only a single missile cruiser ("I'll rely on beams if I can, this is my backup plan"), I'd go for box launchers.
Don't like Thor's main artillery, I'd also prefer 5000-6000km/s, otherwise solid. I'd probably use a single fire control: you already have point defence ships capable of tracking multiple salvos, may as well benefit from the increased accuracy on all guns.
Bem: Very long Maintenance life, but MSP just under 2x Max Repair is awkward.
Maintenance life, deployment time and range don't quite match up for any role I'd have for it, but these things depend on all sorts of assumptions and it looks effective enough.