Okay, hopefully I can help you out. Basically there is no point in buying a 1080p television, so I would stick with 720p to save some money. You are looking at approx. a 37" screen, so you wouldn't be able to tell a difference in resolution between 720 and 1080. Also, 1080p is a bunch of marketing hype anyways. Nothing is broadcast over cable in 1080p, so the only 1080p material you can get is through hddvd or bluray, and both will look just as good in 720p.
Next up is deciding between plasma, dlp, lcos, crt, and lcd. Of all of these tvs, lcds are going to have the worst picture quality. They will still look good, but they don't have deep blacks, or as nice of contrast ratios. Plasmas will look awesome if you are looking for a flat panel tv. They have high contrast ratios, deep blacks, like 178 degree viewing angles, however they don't come in sizes smaller than 42" and tend to be a little more pricey, but you get what you pay for. DLPS and LCOS are pretty much the same, they have awesome pictures, but poor viewing angles. They are also about 8" deep, so no wall mounts. THey aren't a bad deal, and you can get them for cheap because samsung and sony are phasing them out. Look for the sxrds from sony. (i can get you a 50" for $1000)
Other things to keep in mind with tvs:
Inputs, try to get as many of every kind as possible to avoid switch top boxes in the future.
Sound quality: If you aren't hooking up a home theater system, try to get one with decent sound and non distorting speakers.
Refresh rate: try to stay around 6ms (lower is better). Don't buy one with higher than 8ms.
Contrast Ratio: Keep it above 15000:1
Don't buy a large tv if you are sitting 6 ft away. the picture will look terrible