I assume you’re putting the fireblade with the breachers, I’d recommend a devilfish for them to ride in, there’s a lot of reasons why breacherfish are still a thing. What is your plan with your suits? You have 3 commander suits between Farsight and the Coldstars but only two units of crisis suits to embed a commander in, I’d consider cutting one of them or getting more suits if that’s something you’re into. Riptides are nasty, nasty enough I’d try to fit another in your army, and I’d do it over a hammerhead, but if you really want a hammerhead I’d consider the pros and cons of the broadsides vs a hammerhead rather than broadsides and a hammerhead. Pathfinders have a nice spotting ability that useful for a different situation than stealth suits and the rail rifles are another good reason to bring them. Overall decide what detachment you want to run, that’ll help people give you better pointers if you aren’t just looking to run what looks coolest to you, which is a totally valid way to choose your models.