Saurav,
Think about the tonearm/cartridge interaction as similar to the speaker suspension/cabinet interaction. In speakers this is a defining aspect of low frequency extension and articulation. Tonearms and cartridges react in much the same way and have a profound impact on the sound of a...
Saurav,
Back in the day the SL1200 was considered to be an excellent turntable. The reason it became popular as a DJ workhorse was because of the high torque of the motor which allowed it to spin up to speed very quickly (IIRC it was less than 1/2 revolution from full stop to proper speed)...