After numerous rounds of "upgrading" my equipment, I realise that I'm really no better off and perhaps slightly worse of than before I started the upgrade.
I started out with a Losmandy G11/TMB 105/Canon 300D combo, going through a Takahashi "phase" and ending up with a PME/RCOS/SBIG STL combination. Am I happier - NO, am I producing better images - NO, so when is enough - enough.
I would value your comments and experiences: what is it that is really important, the process or the outcome. I suspect that it will vary from person to person.