JWM10 with TNT Cartridge help PLEASE

You have gotten an excellent front end, one good enough to merit a top cartridge. Two cartridges that should be on your "short list" are the Grado Signature and the Shelter 901.

I'm thrilled with the Benz L2 on my JMW 9 (I also use the isolator).

To my ear, it sounds a lot better than the Shelter 501 mk 2 it replaces.

500 people or so will probably write and tell you not to put the 901 0n the jmw10. FWIW, I did (Aries 2 & jmw10)and I enjoyed the combo (and will again if my 2nd arm wand ever gets here).
A popular and less costly way to go for your set up is the Dynavector 20xh or xl, I had this combo (the xh) and it was really very good for the money. If I was smart I could have stayed with it and been happy.
Above is all IMHO & I know didly about the two cartridges you mentioned.

Jeff's recommendation of the Dyna 20X is a good one IMO.I haven't met a Dyna that my former JMW10 didnt like.

Im also however, one of those 500 or so folks that would advise (not necessarily tell you) not to use the Shelter on the JMW.As there are folks using them who find them to sound good to their ears.

Im rather old school and think its important to look at the arm/cart compliance match closely before you mate them with eachother.( Thanks Dad, TWL and Dougdeacon) My reasoning comes from learning the hard way after mounting a expensive Lyra Helikon ( and paying stupid retail for it!!) on the JMW10 with my Aries table. I could never get it to sound fleshed out and kept waiting for it to "break in" and wondering why it sounded so lean and bright for over 150 hours before finally deciding to resell it and loose close to half its value. It all comes down to the proper match to at least hear the best from the cart.It will at least tell you what the true sound of the cart is like to help you decide if you like it or not..

Choose a cart that is of higher compliance Cu's to go on the JMW and you'll be much happier in the end. 12-15 Cu or higher

Of those you listed..the Benz models are good as well as the even better sounding Sumiko Celebration. Blackbird, GRado Sonata or any of the wood bodies..and my personal favorite, the line of ZYX carts. R100 Fuji is killer on that arm.

IMO look past the Koetsu's and Lyra's, Denons, as well as the Shelters. They are great sounding carts to be sure..but you'll not get the best out of them on the JMW-10 The newer JMW 9 Sign may well be much better at accepting the lower Cu designs though..Ken