The 1900Kv is spot on for a 1/8th buggy. 1400kv is for 5-6s only.
4S is the way to go as the BRCA will pobably adopt this for the national series, which will filter down over time to clubs.
BUT your link for battries is a bit strange as they are saddle packs, which would mean a lot of extra wiring to fit enough to make up a 4s setup, this is not ideal, 2 sets of stick packes would be better unless you need them for another car as well....
With the 5500Mah batts you should get about 16 Mins of run time, depending on which track etc.
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