Agree with the A and B except for the B4-6. That engine is no longer produced by Estes.
I am really interested in that C8 (very similar to the old Estes C5) and that 13n-sec 18mm D12 that is very similar to the old Cox D8. Hopefully they will be priced around $4 each.
I would be really interested in the B if it was like the old B14.

__________________
When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !