Replacement for Suntour NCX-410 crankset on commuter bike?
Unless your bottom bracket is giving you issues, you shouldn't need to replace it.  Sealed cartridge bottom brackets have quite long lifespans.

The link you provided indicates that the current crank is designed for a 113mm long spindle (that's the LL113 bit), which is a fairly common size.  My personal favorite square-taper crankset with replacable rings is the Sugino XD-350, which is also designed for a 113mm spindle.  It's basically a drop-in replacement for the cranks you have now.