Most anime are shorter, and won't reach 100+ eps, let alone 50.
Kiba - Wasn't bad, you might enjoy it. 50~ eps.
Hunter x Hunter - 2011 version has 137/138 eps right now, still going on. Highly recommend.
Full Metal Alchemist - 51 eps, then brotherhood with 60~ eps.
Shakugan no Shana - Not sure if you'd like this, it's one of the series that pulled me into anime, though. A few seasons of 24 eps.
Will add more later if need be.
Edit: forgot D. Gray Man - 103 eps. I honestly couldn't finish it, but it's not bad and a longer anime.