The first one, I like most; "Harry Potter and the Philosopher's Stone". Those babies were really cute and their acting was awesome.
Tough one, but DH2 would have to be it, just because of the intensity. Goblet of Fire came in a close second.
I adore them all, but I think a agree with you, Deathly Hallows was just too good. Especially when Neville saves the day! ALL HAIL SIR NEVILLE!
I like the second part, the chamber of secrets the most. If going for action, then deathly hallows second part is good.