Like 38 and ooze said!
the Corsair is a good brand! check out the timings... Faster the better unless your stuck with a P4 using DDR2. THat i have no clue about! Corsair DDR3200 or above is great for a Machine running a 200 FSB but it might be a good idea to get somthing a little futher along to save you the cost int the future (i just want the good stuff that will last, you dont need it)
it always helps to tell us what your putting it into, ever brand and MOBO has some compatability issues from time to time.