Tonearm for Sota Saphire

Having the Sota upgraded and want to change the MMT arm to something "better" and since better could be a cactus needle on the end of a stick to something for which one morgages his/her soul, suggestions would be appreciated. I have an extensive collection of those round flat black things(into 4 figures) and the rest of the system qualifies as high end with equipment to make Wilson WP7"s sound quite delightful. After the Wilsons, I can afford pretty good but probably not great. The tt sits on a solid maple stand with enough isolation to withstand anythig but a direct thermonuclear attack. Brituadio recomends the hopped up Rega. Is there an "audiophile" approved legendary combo? I sure don't mind buying used but how the hell would you be able to tell if an arm has started that downward slide into audio mediocracy due to wearing bearings? Am I sliding down into audio OCD? Think I'll listen to my clock radio for awhile. Thanks in advance.