Rega Owners...which after-market counter weight?

I am looking to "tweak-out" my P25 and wanted to know if any of you guys have done any testing comparing the different counter weights, mats, etc. I know many of you bought one or the other and like the results, but have any of you compared one to the other?

Thanks in advance. :-)

p.s. Anyone that has links to sites that sell the counter weights, could they please be posted? Thanks!