Lpc2000

Hi All !!
I am new to LPC2294 and wish to produce a small code for delay some 
thing like 

void delay (unsigned int Usec)
{
   unsigned int delayUsec= ( ?? ) * Usec;          // line 1
   volatile unsigned int count = 0;                 // line 2
   for (count = 0; count < delayUsec; count++)      //line 3
             {asm volatile ("nop");}               // line 4
}
 where time is the no of micro seconds 
for information I am using a 60MHz crystal on my board

I know it is easy to do with timers 0 and 1 but i wish, NOT to use 
the timers at all as i need them for orther purpose.
My question 
1. is that is there any overhead added due to the code in the 
function for the lines 1,2,3,4 ?
2. is there any over head due to this "delay(/*some value*/)" being 
called in my over all code.?

          If so how much delay? or where can i get the information?

Am i missing some thing or is there a simple way to do this (to 
caliculate the delay with out using tmmers?)


thanks in advance!!

regards,
dennis.