Advice for new gaming monitor

Good advice there. I'd just take it one step further and recommend PLS. It's basically Samsung's implementation of IPS (so it's primarily Samsung monitors that feature it, though there are others too) and delivers the same benefits of IPS combined with (generally) less motion blur. Not that response is particularly bad with IPS, but it's even better with PLS. Asus have a PLS monitor (PB278Q) but it's not cheap. For an exceptional 27" 1440p display though, it's an excellent choice to really see what your GTX780 is capable of. If you'd prefer something cheaper, there are several Samsung 22-24" models with PLS panels.

Most of those abbreviations refer to panel types. All TFT panels belong to those types pretty much.

TN is your basic cheap and nasty (huge colour shift / bad viewing angles*, bad colour accuracy, poor contrast ratios, basically bad colour). Its one saving grace is speed - not all TNs are fast but the fastest monitors generally use TN panels.

IPS fixes the colour shift / viewing angles and colour accuracy of TN, while generally losing a little responsiveness (but barely anything - not that noticeable) and still suffering poor contrast (like TN, they really struggle to achieve deep blacks or any real dark colour, with those shades shifted more into grey).

Like I mentioned before, PLS is Samsung's implementation of IPS and achieves everything IPS achieves while also delivering very fast response (faster infact than most TNs from the high-speed photography comparisons I've seen on TFT Central). It still suffers from poor contrast though. Probably the best all-round current panel technology.

Emphasis on current because PVA (another Samsung panel tech) is my personal preference, though they're rarely used any more. The best PVA models were a couple of years ago (such as the Eizo Foris FS2331, which can now be had for an excellent price, though being an Eizo, was stupidly expensive when it launched). PVA delivers better colour accuracy, viewing angles and colour shift than TN, though not quite as good as IPS or PLS. It's also generally the slowest for response times (though I don't notice any blur while gaming - only during very slow, smooth, steady motions which is usually cutscenes - e.g. a camera panning across a scene). When you're actually playing, no blur is noticeable. Reason I love PVA is it's the only panel type that comes anywhere near CRT for depth of blacks. If you hate the way almost all TFTs show blacks as grey, PVA is the way to go.

And finally you've got MVA / AMVA. MVA is an older panel tech, and AMVA is supposedly an improved version that combines the best aspects of PVA with the speed of TN. I bought one recently and it actually combines the worst aspects of TN with the slower response of PVA - totally pointless tech.

So that's your panel types! I love PVA, but there is some loss of colour accuracy compared to IPS and PLS (though I'd argue that dark colours and true blacks are so important that IPS and PLS lose true colour accuracy in that regard) and it's also not the fastest. If you're most interested in speed and accuracy at the expense of deep blacks, PLS is the way to go (any non-PVA panel will sacrifice blacks). And LED and CCFL are just backlighting tech - most modern panels use LED backlighting which helps the environment, but not much other benefit really. For the widest colour gamuts, RGB LEDs are the best thing available, but they're for graphics professionals - very expensive (£800+ for a 24"er) models.

And as for 120Hz displays, if you decide to put speed above everything else and choose TN then you should absolutely get a 120Hz display. No need to use it for 3D - just benefit from the speed. A 60Hz TN panel is the most pointless choice imaginable (unless it's due to a severely limited budget I suppose). Hope that helps

* with viewing angles by the way, it's not just about people at your side being able to see clearly. It's also about vertical viewing angle and the colour shift as your straighten up in your chair or slouch down - you'll see colour become stronger/weaker and detail appear/disappear depending on how high your eye level is relative to the screen. You'll have strong colour with some loss of detail (at eye level) or clearer detail but washed out colour (away from eye level). So viewing angles relate directly to colour shift and will affect you personally.