I'll be hitting BA Silver (OW Sapphire) with relatively little spend. My family decided to celebrate my father's 70th birthday in Paris, so I decided to go for BA Silver along the way.
Return BA premium economy ticket from KUL to CDG via LHR: 220 TP + 4 BA flights
~1400 USD
Return MH business class ticket from PEN to ICN via KUL: 360 TP
~800 USD
and a pair of OKA-ISG tickets on JL got me over the 600 TP mark.
~200 USD
Total spend about 2400 USD but these were trips that we were planning to take anyway, no TP runs.