What is a decent commander build out. I like the look of the newer flying commander guy.
The Coldstar Commander is not effective on the table, but it's pretty cool. These days, the most common use for a Commander is as a tank for a unit of Marker Drones, outfitted at least with iridium armor and a drone controller, +/- a target lock, missile pods, and stims. Of course, you can run him as an offensive weapon alongside a unit of Crisis Suits armed with whatever you please or as a pure force multiplier (i.e., with all the buffing signature systems but no weapons) in a big unit of something or other - usually Crisis Suits. The marker tank is probably the most effective use currently.
Are fire warriors viable with out a devil fish?
Fire Warriors can be pretty useful in a Hunter Contingent. BS4 does them a lot of good, and the run-then-shoot ability plus 12" supporting fire make them pretty dangerous. Devilfish generally sort of suck, so I'd avoid using them, if possible. That said, Breachers are one of my favorite units in the book and basically require a transport. they're not getting anywhere near 5" of anything on their own. You kind of have to baby them, but they're worth it!
Are marker drones better then pathfinders? I kinda like pathfinders as they fit into the sneaky aspect of the stealth suits parks?
Marker Drones have always been better than Pathfinders, in my opinion, but now that the Drone Net formation exists, there's no contest. +1
BS, interceptor, jink, split fire and other stuff for no extra cost? Yes, please! I mean, if you like Pathfinders, fire away, but they're an inferior choice. You might consider running them in a Ranged Support Cadre so they at least give you double marker htis for the Broadsides in the formation.
Are hammer heads still decent?
No. Tidewall Gunrigs are twin-linked Hammerheads for 2/3 the price.
How should i build my suits out to be?
Crisis Suits, you mean? For offense, I prefer dual
CIB or dual fusion. If you're using them as a troop tax and/or objective holders, dual flamers is a nice option.
Does anyone use the cadre fireblade?
Not really.
Is there no saving grace to a broad side with rail rifle?
It's one of the coolest models
GW makes...but that's about it.