need to calibrate my Monitors?

Hi guys, im from Argentina, i own an old dell 2407 monitor. I used it for like 4 years and not i ordered a new 2711 LCD from Dell.

I will use both monitors, mainly i do web design and as hobby i start making some small videos.

I was thinking about monitor calibration. I need to do it? i want to get the best from my monitors, but dont know if are OK to purchase some product like Datacolor just for home working. No PRO.

If i purchase some product from Datacolor just will use it one time and will drop it in some box becuase i just use 2 monitors and dont purchase new ones every year :D

Well any advice wiill be appreciated!