You sound like you're just getting into the HD realm, so I'll ask. Why are you looking at LCD? LCD is a good technology, but in many cases it's not the best choice. If you're really not going to get HD service I guarantee you'll regret going LCD, none of the digital sets look very good with 480i signals and they're more expensive per inch than other options. If you have a real need for a flat panel then disregard, but most people really don't need to pay twice as much for a few inches less depth. I don't think a cheap LCD is ever a good choice.
You definately want a 1080 set, 1080 is going to be THE format for the life of any set you buy today, if the display can't do 1080 native it's going to be scaling everything and you don't want that.
A 40" 1080 set has an ideal viewing distance of about five feet, most people find when they get HD they want a much bigger screen than what they prefer with SD, otherwise you don't see all the detail you're paying for.
A 1080i CRT or RPCRT is your best bet if you're primarily going to be watching SD for the next few years, they look the best with SD and look really good with HD signals, they're also very cheap right now, downside is they're heavy and the RPs need occasional convergence adjustments.
You should also seriously consider DLP or LCOS. You get a lot more bang for the buck with a 1080p DLP than you do with a flat panel at the moment, you can get a 62" 1080p DLP at Amazon for $1700-$2000 shipped depending on brand (Toshiba, Samsung, Sony)
monoprice.com will save you a ton of money on cables, HDMI and component cables for under $5. There really is no difference between a $5 and a $100 HDMI cable, they either work or they don't.
I own a Philips 30" 1080i CRT $350 and just got a Samsung 1080p 56" DLP for $1600. I looked into LCD and plasma and all the technologies have strengths and weaknesses, but DLP just gives you so much more bang for the buck it was an easy choice for me.