I haven't been able to get the Hunt For Grievous yet... I really, really want it. I got a few of the blue ARC Troopers and a couple of the red ones when they were first released during the Clone Wars line, but the ones in this set are repainted and the Commander is a different mold, so I really want them. Plus the Heavy Gunner is all new, so this set is a no-brainer for me. I love clones. And I have the recently-released animated Clone Wars Gunship to go with them as well. Unfortunately I may have to resort to Ebay for this set, though...
Outisde of that I did get the Skirmish in the Senate set... the Shock Troopers are great, and they go well with the QD versions from the ROTS line. The Senate pod is also awesome, albeit a bit small. Last year I got the Clone Attack on Coruscant, which is great. I was luckily able to get the Jedi Temple Assault as well... the 501st Troopers in the set are better than the carded version. Then before that I snagged the Jedi Vs. Sith set, which to me remains the most impressive set so far. It's the only Pack that's had three brand new figures... Obi-Wan in Clone Trooper gear, Anakin from Clone Wars, and Asajj Ventress. I'm a big fan of the Battle Packs line... I hope they continue it for a long time to come. :)