I recently got the Dark Imperium box set for 40K. If you can find it for less then 100 bucks its a good deal. I just finished the commander from the box set, I think hes a Sergeant? I also got the Army Painter Dark Angel spray to help me get them primed and base coated quicker. 

 Green color scheme. I'm not doing Dark Angels I just like green.

 This is a Dreadnought I primed with the Army Painter. I'll see if my color scheme works ok with it. The Space Marine above was just brush primed black and then base coated with Reaper.