It really does depend on what avionics package you have. The basic cost is around the £400k mark but is significantly increased with any equipment you have installed, plus paint job, plus leather seats, plus HiFi/CD etc. There are a few used machines around for sale in europe that would be a better deal.
The 120 I have been flying was a high spec 500hr aircraft and recently sold for around £550k.
Don't forget about the maintenance costs, they can run to $20k per year!
Lovely machine to fly though.