haha, my order form IJK has just been confirmed.
I was in the same place as you. I wanted to upgrade the 160G hard drive in my MacBook. I was not sure which to go, 5400 or 7200 and power consumption was my concern. Finally after reading reviews and datasheet of some drives, I decided to go Hitachi 500G 2.5" 5400rpm Travelstar 5K500.B SATA II 3.0Gbs, 8MB Cache. It's $66 from IJK.
Any 7200 RPM drive has more power consumption, and also has more vibration.
I also ordered Astone ISO-SL230 Silver 2.5"" SATA to USB2.0 Compact Enclosure Silver from IJK for $25.