If you can do Malygos at 80 with reasonably geared characters (ie not in 2 years when you have tier 11 or whatever out and buyable with honor) I would say you win wow. 3 drakes Obsidium Sanctum as well would be super impressive, both are imo on the same level of difficulty (for different reasons - Malygos for vehicle combat, 3 drakes for technical fight and gear/skill issues).

Sorry, many people here posting have never done Malygos - its a HARD HARD fight solo, let alone with 10! It all goes back to vehicle combat, since there is no /follow mechanism for vehicles, you have to either control all your chars individually, or use pass-through for all movement and move all of them at once. One simple mis-move and it will be a quick chain wipe. Only a few guilds on each server have done Malygos 10. Remember, 10 mans are generally harder than 25 mans, since 1 person dying = 10% of the raid gone, vs 1 in 25 is just 4%.

Just go in and solo play heroic oculus and you'll appreciate the challenges, with a lot of practice and luck Oculus can be solo'd, but not by me and not by most of the people posting here. Heck most PUGs fail heroic Oculus. Malygos is 10x harder.

Remember, pre 3.0 I think only 1-2 people "solo'd" naxx. Out of thousands of multiboxers. I'd say right now maybe 1-3 people have solo'd heroic oculus. I think its actually just 1 (lol). I've run the instance once on each of my characters (solo in pugs) and am never doing it again, its just way too frustrating.

Sam's not even in the picture really, its just Prepared and the few other 10 boxxers lurking out there. Sam won't have any character to 80 for at least another year, by which time the next expansion (or WoW2) will have leaked out.