Help me decide on my next cartridge (

Cantilever type and mass is related to frequency response.
Stylus type is related to groove wear, sound quality and diamond life span.

Do not limit yourself with a choice of cartridges available in the shops today, we’re living in the digital era, there are much better cartridges produced in analog era (especially under $1k).

After reading many comments about serious problem with brand new Ortofon 2M cartridge pins (falling out when people trying to remove the lead wires) i can only think how poor is the quality control at the Ortofon today. I have never experienced anything like that even with 30 years old cartridges.

I think you're probably better off selling the TT and putting your proceeds and additional funds towards a better table.  In my view it's your weakest link in the chain, not the cartridge.

I'm with three_easy_payments here 

your table is $500-$600 new, a $900 cart is not going to make that much difference. If your cart is done/wore out then yes by all means buy a new cart and upgrade. when you do think about your next table-arm and make sure your new cart will work compliance wise with your upgrade path. At lease that way you have a cart you can upgrade with. also better carts are worth rebuilding so that's something to consider. 

One member here mentioned to buy a NOS cart, i'm sceptical of that due to the suspension systems degradation over time. NOS carts should be bought with the understanding they may need a rebuild. heck any used cart for that mater. 

If you don't have a MC phono section in your parasound that's something else to think about as well.  

SHURE ULTRA 500 sounds good everywhere, quote from cart expert David (dlaloum) I couldn´t agree more. You won´t be disappointed, + new HQ replacement styli available from JICO Japan.
SHURE ULTRA 400, 2nd best from SHURE. Both for ridiculous prices, not so easy to find though.

But firstly, you need a better TT, I highly recommend ORACLE DELPHI MKII because it´s simply musical.

Good luck !