Photoshop :: Web RGB To CMYK Meter

I have used the digital color meter in apples os to find rgb colors in a image. I was trying to find one that would give me the closest cmyk equvelent to the web color on my clients site. 
 
The problem is that i used a hex value in Photoshop to create the colors on a bizcard. but all of them came out darker that desired. This is the second time it has happened. I am starting to believe that hex values and cmyk are not friends.

I do not have 500+ dollar for a new screen. I own a LG 2750 that was as close to an apple monitor ad i could see (compared with the naked eye and some gradients as a baseline). This monitor makes everything look brighter than it is so i compensat for that by making things slightly brighter than what my eye preceves is right. My othe screen is its opposite, making every thing darker.
 
This why i was needing a meter that would allow me to see the cmyk formula for the pixel i am hovering over. I would also wnat it to tell me whether this was a already a native cmyk formula (native to its range) or if it was just a closest estimation.