What to look for when buying recessed lights?
The fixtures you linked to are absolutely fine for new construction sheetrock ceilings.  If you are going to use suspended acoustical tile then you will need a different model fixture that mounts directly to the tiles, not the floor joists. 

In either case, you can lamp them with CFL bulbs which will burn cooler, less electricity. The only disadvantage to standard CFL's is that they can not be dimmed with an inexpensive incandescent dimmer. Always be sure to match the dimmer and bulbs correctly.