Can I have my plasma mounted above the fireplace?
Yes, depending on a few factors most plasma and LCD tv's will mount on either brick or drywall fireplaces.
I hate my current installation! Do I have any options besides totally redoing the complete installation?
No, In most cases with a site survey or labor only purchase most installations can be fixed and repaired for far less then a complete installation.
What are some of the pros and cons of buying electronic & install packages together?
Pros - Most packages including both install and components will save you money and time, as well as having one individual performing the work from end to end.
Cons - If the individual buying the components doesnt match them with customer expectations and needs to there installations, do the research and find a qualified installation team.