Best cartridge for SME 5 Tonearm?

...I was told that Ortofo (I am currently using the Ortofon) are not the best matches for this arm due to the design,....

Absolutely not. Ortofon cartridges are a superb match with the SME tapered magnesium arms. The Cadenza series, a NOS Jubilee and the stunning Windfeld are all perfect on the SME arms as are the older style models such as the Rohmann and the MC5000.

Really, that is interesting to know.
I had one dealer who said its not a good match, they carry everthing but SME and the other said, its ok, thanks for the observation. I will definately look into it. I am using the 2M Black and its ok, I know I need a better cartridge since this was just a temporary setup, I do like the Koestu Urushi very much with the SME arm since I have used the Koesto with my SME4 arm before with stunning results and even some of the Grado under $1k did well. I have to look at the more costly Ortofon to see how they work with the SME

Also, maybe I should throw this in once the compatibility is determined....I am looking for a highly detailed but warm sounding cartridge with generous bottom end.

Hope my description is not fuzzy to all. Thanks

You can get highly detailed with a good Ortofon cartridge but you won't get warmth as such unless the recording has that warmth.

If you were just looking for a something that is... highly detailed but warm sounding cartridge with generous bottom end, then i would whole heartedly recommend something from Phase Tech/Phasemation. However those will definitely not work in a magnesium SME arm as they need a heavier arm or the tracking is poor.