From my Experience, I think you better try the 6.0 first, make few complicated code and test it many many times before you decide to move your old 5.0 to new 6.0.
I have a lot of headache workin with VFP6.0, specially with C0000005 prob's (which is no solution at all up till now).
Senna
Senna Dwipayana
Being good is better
Being better is a bless