I could talk about stouts all day. If it says stout on the label I'll give it a shot. I only mentioned chocolate and milk/sweet stouts in my previous post because that's what you were talking about. There's a ton of tasty stouts, and Stone's Russian Imperial is one of them. They make(made?) a version with espresso in it that was also really tasty. I have never tried the Lancaster Milk Stout (not available here) so I can't compare it to Left Hand but there's a big difference between the purple labeled Milk Stout and the black labeled Milk Stout Nitro. The nitro makes it so smooth and creamy and mellows the flavor a bit (same is true of the Young's Double Chocolate...can is superior to bottle). If somebody asked me to list my favorite beers it would be a pretty long list since I've probably tried a couple of hundred in the last 2 or 3 years but off the top of my head in no particular order and sticking to stouts I would say:
Rogue Chocolate Stout
Left Hand Milk Stout Nitro
Stone Russian Imperial Stout
Stone Russian Imperial Stout with Espresso
North Coast Old Rasputin
Southern Star Buried Hatchet Stout
Stone/Ken Schmidt/Iron Fist Mint Chocolate Imperial Stout
Speakeasy Barrel Aged Scarface Imperial Stout
New Belgium Lips of Faith Imperial Coffee Chocolate Stout
Great Divide Yeti Imperial Stout
Steelhead Extra Stout
Knee Deep Imperial Tanilla
Deschutes The Abyss
Deschutes Black Butte XXIV (and XXII and XXIII and XXV)
Olvisholt Lava Smoked Imperial Stout
Lost Coast 8 Ball Stout
Clown Shoes Chocolate Sombrero Mexican Style Stout
Young's Double Chocolate Stout (can!)
Samuel Smiths Organic Chocolate Stout
Founders Breakfast Stout
And why not a few porters since they're often similar:
Laughing Dog Anubis Imperial Coffee Porter
Ballast Point Victory at Sea Imperial Porter
Founders Porter
Left Hand Black Jack Porter
Steelhead Porter
Stone Smoked Porter with Vanilla Bean
and I'm still happy every time I open a bottle of Stone Smoked Porter