I have three Schick 12" arms. Needless to say, I think it is an excellent choice.
Works great on the SPU, my favorite, but also takes DL103 to a new level. Bearings are rock solid and it can really cope with carts that put a lot of energy into the arm, such as the 103.
I have used it with carts with compliance up to about 20.
Before the Schicks, I used SME 3012s for a few decades...no contest. The SME is smeared and slow by comparison, although enjoyable.
Contact Thomas direct. Great guy. He is a good friend of mine, so my recommendation is not anonymous, but I paid for the arms I have, even though he would have given me at least one or two.
There is surely a wait but there are reasons for it. he build them himself and he is very meticulous, plus demand exceeds supply.
ATP-12/16 is a good second choice or placeholder, especially for the $$.
Be careful of vintage Ortofons. According to Schick, Frank Schroeder, and a few other phono specialists in my circle, these arms usually need service-- a lot of them are beat or full of sticky dried grease.
You can see my 301 here
https://jelabs.blogspot.com/2016/07/capital-audiofest-2016.html
http://www.enjoythemusic.com/Capital_Audiofest_2016/DC_DIY_Audio_Club/
https://www.stereophile.com/content/caf2016-do-go-back-rockville
Ak'er Allan aka analog addict built that nice walnut burl plinth for me.