If you include 3 with champ next to a dragon this leaves you 735 PTS at swift death which means either 2 Varkolaks or 4 reapers with weapon option at maximum.
So if you want a blockpartner for your Dragon you better go with a fellwraith on monsterous revenant. Which leaves enough room at Swift Death for a 500 PTS unit and a Varkolak and also it g gives you don't give up some hp for possible plopping.
Also you got all the options to sniper champs with Evocation and Occultism.
Vampire Counts list blog: VampsinMD list blog: Time to try VK - VC List-building - The 9th Age (the-ninth-age.com)