I personally am going to take all of them with my dm/fa/sm scrapper. End game though you should be fine in most situations with just soul consumption. You need to take healing flames as its your only decent heal. You would also be silly not to take siphon life since it does great damage and helps keep you up with a 10% heal. If you dont get shadow meld though, you'll need to get some defense or heal from somewhere. Check this link for more info:
http://boards.cityofheroes.com/showthread.php?t=253503
Justin
