I'm on my second Grace F9E cartridge. Not knowing any better, I'm thinking that it's getting long in the tooth. If I don't have anything else to compare it to, how do I know if I need a replacement? And if I do replace it, is there a currently available cartridge that comes close (or surpasses) the Grace in the same price range (<$500)? Or should I just send the old guy to Sound Smith to get it re-tipped? Any advice would be appreciated.