My initial hunch that the RX200 would be a 316L calibrated TCR may be wrong. I'm pretty sure the Joyetech eVic VTC Mini's SS TCR is based on 304.
The RX200 being a Joyetech chip, it might be using that.
304, 316, 316L and 317L are all close enough, that it can work with just some temp adjustment. SS 430 probably also works with temp adjustment, but may be a bit out of range. I have some 430 on the way and will confirm.
Worst case, any SS coil can be fired in wattage mode.
In theory, all the SS grades have an even higher TC Precision value than Nickel, once the base resistance is factored in (even though it has a lower TCR value). That accuracy helps the situation, too.
So I guess what I'm saying is, while the DNA200 is clearly superior in terms of wire flexibility, the RX200 should be able to deliver on most coils even a veteran vapist would throw at it.
Once mine arrives, I'll do some A/Bs against a DNA200 with Steam-engine profiles, for all the SS grades I have, and post my thoughts.