Lara,
I totally understand about back problems, as I have a major issue with my back (put me out of work) and has been quite sore the past fews weeks to the point of having to take stronger medications. Has settled a little but still gets me right in the lower left lumbar and left leg.
Before you make any major purchases on camera equipment, please post in the forum and get some replies, especially prices etc and what people feel about what you are looking at. I certainly have done in the past and do when unsure and take on board what others comment on.
I think the virus I got has gone off the computer, hence why I haven't been posting anything last few days because of that. Thanks again for the help and links you supplied in computing forums.