The Dreadnoughts get real expensive real fast, drop pod, Ven status, xtra armor, heavy flamer, your looking at a pricey unit that doesn't give you a DC member. I used to run Drop Podding Dreads, however they are just too inconsistent, if they survive and charge then its great. However a high profile target like that behind enemy lines usually gets alot of anti tank attention.
I prefer running 6-8 man Vet Assault Squads w/Thunder Hammer and two Meltas, they're just more versatile and you get a DC member. DC and VAS are like Ketchup and Mustard they just go well together:biggrin:. But its really personal preference and using the models you own. Hope this helps.
Good Luck...