Posted for "Chuck Jensen" <cjensen@dts9000.com>:

 Simple break points for the decision.
 
 430 VFR with occasional light IFR (don't even bother flaming about
 'light'!) and a lot of 'direct'
 530 VFR with more regular IFR
 480 IFR on a regular basis, especially in complex air space (northeast,
 southern CA)
 
 As Ron mentioned, the 480 combined with the MX20 (or the MX200, a new
 iteration), is a powerful combination that once familiar with the menus
 system, is very intuitive and much more user friendly than the 430/530.
 
 Chuck Jensen