The MONBOSH is going to feel alot like your Fleet Sovereign. (which is a great ship btw)
If you're really looking for a change of pace look towards a science ship or escort. You can buy a mirror ship cheaply and test it before deciding. Better to test than waste 100 million EC on something your not going to like.
Strangely enough I just went BACK to the Assault Cruiser from my Oddy and my Avenger Battlecruiser. It still does a lot of damage and tanks a lot of incoming fire. There's honestly nothing wrong with the ship.
If you just want to try some other ships out look for either of the 2 mirror escorts on the exchange. They're pretty cheap and only cost ECs. That'll give you a different playstyle without breaking the bank.
Other than that -- and this is just a personal suggestion -- might I suggest the temporal destroyer from the lobi store? Universal slots so you can customize it as you wish. Or for a very different playstyle, JHDC for some carrier play-style.
its not due to my FAC underperforming as such im runing an A2B setup on it atm, im just looking for a bit of a change in terms of ship alltogether, even if it plays similar, as long as its a diffrant ship.
i'de like to hear more about the jem'hadar dread, whats its performace like in a pvp environment, and how do you generaly build them ? do you go A2B with beams coz of the low turn rate ?
Look into something different from just a cruiser. Galor cost an arm and leg, and frankly, isn't that much different, much less "better" than the fleet cruiser you have. It's decent, but is dated and doesn't offer anything extraordinary, the feel is similar to a much cheaper excelsior.