Leviathan Dreadnaughts are certainly quite strong, though personally I've got a soft spot for the Contemptor (it feels tough/scary in a way that the ordinary boxnaughts just don't).
From my experience on the tabletop I can also recommend the Fire Raptor, it's a tremendously cost-effective source of guns (420pts and you get around four Devastator squads' worth of hitting power), with PotMS for accuracy, a good mix of volume and strength, and the ranges and durability conspire to make it pretty annoying to get rid of.
Alternately get FW Guilliman and use Guilliman's rules with a model that doesn't look like a bloated Thousand Son whose face has shrunk in the wash.
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