I've been planning on getting an iMac since December, and even with the rumors of a refresh soon...I just can't wait. Anyway, while checking out the online stores I just found out that there's a difference in the model number of the 21.5 inch 2.5 Ghz iMacs sold in the Philippines (which is MC309ZP/A) and the US (MC309LL/A).Can someone tell me what the difference is? This is going to be my first iMac...and well I want the best (I can afford right now) out there. Thank you for any information you can share. 