BigDave, you've spent nearly half of your points on three models. Dude, dump one of the big three and bulk up. At this level of points you don't really need two HQ's.
Also I mentioned on some other post that I didn't believe that the 'Lith needed to be in a 1500 piont army, cause between it and your HQ choice you've lost like 400 points. I stick by it here as well. One problem is, that for what you paid for the lith, most armies can field two tanks. If I had two tanks in a battle against your army I'd prolly ignore your 'Lith as much as I could and try and rip up your troops with my big guns.
You can prolly pull a win, but don't let yourself get spread too thin across the board. I see a defeat if you let that happen. Oh and don't forget to put D-fields on you scarabs, d-strike em, and screw with enemy armor.
Good luck man
-D