The only right answer is The Locus of Konoha ("Flashback Arc")
Some one tell me why the flip should we get part 1 fillers in Shipouden. What's wrong with getting actually proper flashback fillers of legendary ninja like past Hokage, Sannin in their youth, the uchiha clan, etc. Not that crap.
Yota wasn't good winter but it only lasted a couple episodes. So it was bearable. In fact I didn't actually mind it, it was touching seeing Naruto make his first real friend, should have included little Sasuke though.