A Note About 1080i
1080i stands for 1080 Interlaced. It is an HDTV format in which two images are interlaced frame by frame to create a whole 1080 size image. 1080i is rarely seen today, and I generally recommend staying away from it. This is not because 1080i is terrible, but simply because there is no real price obstacle between 1080p and 1080i. Also, there are extremely few new 1080i HDTVs being made today, so an 1080i HDTV found at a store is likely an older model.
Connections
Overlooking connections is easy to do when buying an HDTV. First-time buyers are particularly vulnerable as they often do not know what kind of devices they will buy in the future to accompany their HDTV. There are several particular kinds of connections which a buyer should look for.
HDMI - HDMI is a standard which came about with HDTVs and was constructed to provide the high bandwidth needed for HDTV video and high-quality audio. HDMI ports are found on virtually every home theater device for sale today including DVD and Blu-Ray players, AV receivers, and gaming consoles. Having at least three is a good idea, although one could get by with two if the HDTV is not going to be part of a dedicated home theater.
DVI/VGA - DVI is a common modern PC connection. Many new PCs will have an HDMI connection as well, but for PCs a few years old DVI will probably be the only video output. VGA is an even older PC connection which is often times not supported on new HDTVs but when can be useful when connecting a old HTPC to a new HDTV.
Component - Component connections are a series of connections which were very common before the rise of HDMI. Most older DVD players and AV receivers will require component connections. Having at least two is a must.
S-Video - While rarely used today, S-Video was seen on a fair number of business laptops in the last five years. An S-Video connection isn't required on any HDTV unless there is a specific device in the home which will require its use.
Wrapping It Up
This is the end of the guide, but it shouldn't be the end of one's research. The next and final step in buying an HDTV is to research which brands are the best. Generally speaking, Samsung and Sony are the best LCD HDTV makes while Panasonic and Pioneer provide the best plasmas. There are always new products, however, so taking a good around BrightHub for the latest HDTV reviews is a good idea.
In any case, don't get fooled by technological mumbo-jumbo. If the 720p HDTV looks better than the 1080p set, then buy 720p. There is no accounting for taste, and while enthusiasts know that there are certain ways video should be reproduced, the rest of us tend have preferences.
HDTV Buying Guide
Buying an HDTV can seem daunting, but don't worry. Once a few basic topics are understood, HDTVs don't appear so imposing. In fact, the process of finding and buying the right HDTV can be a lot of fun.