Wow, lots of replies.
@Rich: I totally missed the changed rules for those. I figured they were still heavy 2. I'll definitely be removing it.
@ Steve: I don't like the idea of limiting my HQ's movement. Terminator armor is wicked cool, but then he won't be able to take alternate forms of movement or ride in rhinos.
@Paul: I think my complaining on facebook might have come off the wrong way. Necrons suck against plague marines something fierce (not everything) and I'm aware that its going to take some time to get the hang of a new edition. I decided something different would be good mostly because Necron options are so limited (especially in Apocalypse, which is what I'm looking forward to most) and I loved playing Chaos last time I was invested in the game. I get that Thousand Sons have some problems, but I'm really just looking for an army with a better theme, newer codex (mostly to avoid a lot of the rules problems I've run into with the Necrons), more modeling possibilities, and some actual apocalypse stuff.
Anyway, thanks for all the advice guys. Some small details aside, I think I'll aim to get this list together.