You should probably note that Rock Polish Golurk actually wins against Starmie and Tentacruel because it has Shadow Punch and Earthquake STABs to hit them. I know it is rare (to say the least) but some people use it. I know they win most of the times, this is just something you might want to consider (or not, because lol it's Rock Polish Golurk).
I guess the most common spinblocking strategy nowadays is Deoxys-D + a Ghost. This is just annoying and very hard to deal with. Since Gengar and Jellicent are the most common spinblockers, Starmie and SubToxic Tentacruel do very well against this core, but they will not always win. I honestly dislike teams that use this core. I find Deoxys-D to be something that is able to completely unbalance a match, especially if the same teams carries a Ghost.
To me, the one spinblocker that has most uses is Sableye. I know this depends a lot on the team you're running, but it is just unbelievably good. Priority in Taunt, WoW and Recover is just awesome. He also has no weakness, which means he is not Pursuit weak; in fact, he can just WoW CB Tyranitar, Recover the damage and then switch out.