Budget: SPCMC2 (AT831): cardioid caps only (not changeable)
Best sound: SPCMC4 (AT853): Card/hyper, sub-card caps available, no omnis
Flexibility: SPCMC8 (ES943s): card/omni/hyper (interchangeable caps)
Your choice, all sound great (to my ears). SPCMC4s can overload under high SPLs (with standard battery box, solution is to phantom power them), and I am testing the loaner pair of SPCMC6s (=CMC8s, but with Hyper caps) in a couple of weeks at high volume.