Dual 505-2 with OM10 Ortofon. Upgrade questions

Okay, so I've had this turntable for 10 years or so and haven't done anything with it in that period of time except include a preamp to filter subsonic frequencies.  I have NO knowledge on turntable upkeep and tuning.  So I'm wondering if I can upgrade the stylus to a diamond stylus and keep the same cartridge?  I saw some talk about the Super OM cartridge, what benefits does the super  version have?  I want a simple upgrade to minimize any necessary arm adjustments.  If anyone can point me to a site with a lot of information on the Ortofon products, that would also be helpful.