I'm thinking about making the move from direct view to rear projection TVs, and I have a couple general questions: 1.) I read on another site that one of the negative aspects of owning a RPTV is that "periodic maintenance is required". What kind of maintenance, and how frequent? Do you have to have the TV repair guy on speed dial, or is it just every few years? Also, how often do the CRT guns need to be replaced or realigned? 2.) For HDTV owners, how bad does 4:3 material look on it? This is a subjective question, but I'd love to hear some opinions. It seems like watching low quality analog TV programs and black and white 4:3 movies with gray bars on the side would be pretty bad. Thanks in advance for any help.