The black shadows are great for blues but not classic rock. I did the same thing and did a 4x12 with 2 vintage 30's and 2 G12H's in an X pattern. It did a much better job at getting the classic rock tones, but it's not a 1x12.
I don't know eminence's line up that well so I'll defer to others on that. The price is challenging. I would see if Weber has anything out there that suits your needs.
Absent of price, I would look into Austin Speaker Works. I heard good things. They specialize in taking classic low wattage speakers and creating higher wattage versions of them. They started their business as a repair center for the classic celestion speakers. For classic rock, I would like at these: http://austinspeakerworks.com/Crossroads-p-16139.html, but you would need to keep the amp in the 50W mode. They are expensive though. I know it's way out of your price range, but I thought I would share anyway.