Fortunately, I've got two tournaments in September, which makes some decisions for me.
In about a week and a half, we're having a small 40K tournament at GPC. I'll be rocking the Daemons, of course, but realized I've only finished painting one octet of Blood Horrors... so I need to wrap up the other octet before next Saturday. Fortunately, they're half painted: I just need to highlight the flesh and go from there.
At the end of the month, I'm going to Blob's Park. The damn thing is 2,800 points, which means I need to paint another 300 points of Skaven by the end of the month. That's poop. The path of least resistance is, I think, to run a second Warp Lightning Cannon (since I have it painted), beef out my Stormvermin (since I need to get up to 700 points of Core... and they're painted), and paint up 6 Globadiers and another Warmachine (I'm thinking Doomflayers, just for the heck of it).
That should get me through to October. After that, it's tough to say. Necrons should be on the horizon, and I'm hungry for them. I'm eagerly awaiting an a-tier army to buy into and play. I'm also still worked up about a Nordland Empire army, but that's a large enough effort to keep me from hitting the Necrons when they come out. Also, it'd be sooo easy to knock out an Ogres army just for something different.
Fortunately, I've got until the end of the month to figure out what I'm going to do.