Was just about to buy a Spyder 3 Pro calibration set up, but now I'm not sure I should, the more I google on the subject the more confused I become

Cant seem to find the relevant details of my monitor to set up a Spyder 3 properly, all I have found so far is........

ASUS VW 222U monitor
2ms response
Flat Panel LCD/TFT
22 inch
2000:1 contrast ratio
max resolution = 1680 x 1050
brightness 300CD/M2 { whatever the hell this means ? }
Backlit I think ?

Been googling for a while and have found no more info on my monitor than that. Also been searching for comments regarding using the Spyder 3 pro on various monitors and found a couple of comments basically stating that as a general rule Spyder 3 Pro calibration is quite good, but apparently on any monitor valued at under around $800.00 is not going to work well. My ASUS I think always looks dam good, colours always look very natural, comments on forums I post to indicate that, but seems maybe it's a waste of time buying a good calibration tool for this monitor as it doesn't rate in the high price bracket.

buggered if I know .....any thoughts ?