Brennonjw wrote:mine's keeping the sword (dunno if you can actually replace the force-fist) and going for either volkite, kheres, or an extra fist (and a pod in that case)
You must take the force fist but it's not a terrible option it's still makes you s10 and bonus attacks as well as you can give it another melee for more attacks. The instant death option is also not bad as it allows your dread to charge and just slay a bunch of mechnicum bots which it normally couldn't do.
Personally I think the following are options to consider.
Chainfist it's pretty cheap lets you punch up vehicles really easily and combos the best with another melee weapon.
Kheres assault cannon it's just a good weapon but the osirion is a bit expensive a platform for this option though shooting is nice especially if footslogging (though you may just want to run instead). The kheres is also basically straight up better than the culverin rending better
ap and 2 more shots beats put twin linked and deflagate.
Everything else is mostly not great especially the special plasma cannon as it's very expensive.