Wow... I am really confused by the different ESC's, programmers and software

I am looking to run 17.5 TC (both no timing and open) as well as 10.5 TC
So for software; I imagine I use “508_no_timing” for 17.5 no timing and “528stock” for 17.5 open and 10.5?
As for which ESC: What is the difference between the GT2.1 Prostock (EXT98802PROscb) and GT2.0 LPF (EXT98802LPFcb)?

I am also running 17.5 12th scale no timing… so I guess the software to use is also “508_no_timing” and the ESC to get would be the GT V2.1 EX (EXT98802LPFSCB)?

As for the programmer; I suppose I need to pick up the “LCD Professional Program Card” (SPLCD01) and download the V1.32 software?

Any help/advice would be greatly appreciated