You don't really need to upgrade Macs tho. They (and the software) don't advance at the rapid rate the Windows world does.
Alienware M11x R1 Netbook:
1.3GHz Core2 Duo U7300 (OC'd to 1.7GHz) | 8GB Corsair DDR3 1333MHz | nVIDIA GeForce GT 335M 1GB/Intel GMA 4500MHD Hyrbid Graphics System | Western Digital Scorpio Black 500GB | Microsoft Windows 7 Home Premium 64-bit
Microsoft Certified Desktop Support Technician | CompTIA A+ Certified