Pretty much any Stone Cold moment from the feud with Vince up to but not including the heel turn.
My all time favourite Austin segment is when he took over as the CEO. My other top favourites were Bang: 316 when Vince pissed his pants in the ring, the zamboni, the beer truck, the first stunner to Vince, the cement corvette, the bed pan attack, throwing the Rock's title in the river, the promo with Vince the night after he became champion. There's just so many good ones.
Non Austin moments are a little harder. I thought it was funny when DX played with Vince's mic. There's a ton of good Edge and Christian ones. GENITAL WARTS RULE! is a favourite of mine. The one that sticks out the most is when Edge and Christian sat down in a theater and watched homemade videos of the Hardy'z when they were kids and just ridiculed the hell out of them. It's the best thing ever, go find it on Youtube. There's some good Undertaker and Kane stuff from the original feud. I liked Paul Bearer's promo on Taker - YOU'RE A GOD DAMN MURDERER!
Punk's promo from last year in Vegas is a classic, of course.
The Nexus attack was amazing, just because it totally came out of the blue, it was so different than what we usually see.
There's a ton of moments that stand out, but when you've seen so much of Raw over the years, it's kind of hard to figure out all of them, they kinda get garbled together unless they were really big or just left some kind of huge impression on you for some reason.