Hi - I know the Audiomods arm, I have set a couple up, including one on a the top of the range Platine Verdier turntable,.@dover
In my view forget about the Denon 103 standard or modded - the arm does not suit it.
For your budget for a MC under $700 my recommendation would be
AT33PTG/2 -this is an excellent cartridge with boron cantilver and micro ridge advanced profile stylus. It is very musical - around $650
ATOC9/XML - again this is an excellent cartridge with boron cantilever and microridge stylus - around $550
The AT33PTG/2 is a very well balnced, smooth, detailed cartridge that punches well above its price. The OC9/XML, again excellent value for money, has a little more bottom end punch than the AT33. Between the 2 its a choice of beautiful balance ( AT33) , or more punch (OC9).
Although the OC9/XML is not the top of the OC9 range this is the most musical of the OC9 range, the microlinear stylus is not as finicky as the higher priced shibata which can sound brittle.
Same with the AT33PTG/2 - the micro linear stylus profile has the best balance of detail and not to bright or brittle.
My own prefernce of the 2 is the AT33PTG/2 - its a fantastic cartridge for the money. For reference I currently use Koetsu, Ikeda and Dynavector cartridges north of $5k but could happily listen to the AT33PTG/2.
thank you so much, I reread some emails from Jeff at Audiomods and reached back out to him and he said almost verbatim what you said. I did a lot of reading last night between three models of AT’s two of which are mentioned above and decided I am 100% going for the AT33PTG/2 I think it will be a great place to start and when I get up to the Dynavector XX2 that is where I will move. I need to learn my arm and pick what’s best for it