Alpha Male....
I think this example is illustrative.
This was without 'shopping around' the various PC manufacturers
I only visited the Mesh website for the PC, and the Apple website for the Mac:
20in iMac.
20in Monitor
2.0GHz Intel Core 2 Duo (dual core CPU)
1GB RAM
250GB HD
128MB ATi HD2400XT graphics
Price: 799 UKP (incl VAT)
Mesh:
22in Monitor
2.4GHz Core 2 Quad Q6600 (quad core CPU)
4GB RAM
500GB HD
256MB Nvidia 8500GT
Price 799 UKP (incl VAT)
I know which one looks like better value to me!