Number one.....the old CRT's are heavy so be prepared or get someone to help you remove them.
Most of the newer LED LCD tv's are HD capable so that should not be an issue.
If you watch a lot of sports, a faster refresh rate is better.
Viewing angle isn't as important as it used to be. The newer TV's have a pretty wide viewing angle.
If you are going to hook it up to your existing amplifier and speaker system, then most of the new TV's have this capability. If not, you may want a TV with speakers on the front, especially if you are going to build it in to a cabinet.
When running cables the TV input and receiver output will dictate what you need.
If you are a Sam's Club member, go in to their store because they usually all have a huge TV display area for TV's of all sizes. Take you tape measure with you to find the one you need.
