New cartridge and/or tonearm for a Delphi Mk1

Good old SME III for classic high compliant cartridges from the Golden Era such as Audio-Technica,  Shure, Grace etc. You have a great TT, good luck.
If you are looking for a new cartridge I highly recommend this: Audio-Technica AT-ART9 is just suberb

Your best choice of cartridge depends on both the pickup arm and your phono preamp. The SME arms do work very well on the Oracles.

Pulled the trigger and own the Mk 1...  Thanks for the quick responses - I'll go again to Oracle's site and look at the SME and also learn more of them here.  One thing decent about the Oracle Delphi is that parts are available to upgrade from the mfr if that was determined a need.  Right now it plays great - needs a dusting but otherwise so far so good.  The tone arm is a Mayware (uni-pivot), with an Ortofon OMP30.  That's what I know so far - will play it for a few months and see where it's at.  
Thanks again!  

I used to own a Mayware tonearm. It matches well with high compliance moving magnet cartridges. I used mine with a Sonus Blue.

the only real issues you will have with an arm is the weight of the arm as the table is fully suspended the springs in the towers will need to be tuned to the arm weight. I’ve owned 4 Oracle Delphi’s over the years and they are a great table specially at the prices for a good mk1-2. Make sure the motor is not cogging as the thrust bearings tend to loosen a bit over the years and can be adjusted. also a better 24vdc power supply goes a long way over the wall wart. I’ve used various arms as well. had excellent results from a rega rb600 and rb 250 on the lower end of pricing with the proper oracle arm board ( that’s an aluminum arm board replacement for the smoked one) then you can move up to the SME arms or others just remember the weight of the arm is something you need to keep in mind for suspension tuning. also highly recommend the oracle suspension upgrade kit this is not the replacement kit that changes your whole tower just the inexpensive rebuild kit i think its around $200. that comes with all the internal parts for the towers a spring set and bearing oil. properly set up you will be very happy with the table. oh one more thing take the dam dust cover off they induce quite a bit of coloration into the music. also put some cones under the feet just stick them on with some blue tack.