I personally would never go back to 60Hz after experiencing what it is like to game at 100Hz, especially if your system is capable of maintaining over 60FPS. There is a huge difference between 60Hz and 100Hz+, the responsive, fluidness, and smoothness of all games is intoxicating.
If you've spent $1500+ on a rig, why cheap out on the one component that you spend 99% of your time looking at when using that system? Spending the money on a rig only to buy a $200 1080p 60Hz monitor is like buying a Ferrari so you can sit in traffic.
However if you are considering buying a new monitor based on manufacturer advertised response times, quite simply, don't. Most if not all of those figures are exaggerations or just flat out false. To get an actual measure of 'lag', most reviewers and consumers consider this a combined total of signal processing time and response times.
From TFTCentral:
To avoid confusion with different terminology we will refer to this section of our reviews as just "lag" from now on, as there are a few different aspects to consider, and different interpretations of the term "input lag". We will consider the following points here as much as possible. The overall "display lag" is the first, that being the delay between the image being shown on the TFT display and that being shown on a CRT. This is what many people will know as input lag and originally was the measure made to explain why the image is a little behind when using a CRT. The older stopwatch based methods were the common way to measure this in the past, but through advanced studies have been shown to be quite inaccurate. As a result, more advanced tools like SMTT provide a method to measure that delay between a TFT and CRT while removing the inaccuracies of older stopwatch methods.
In reality that lag / delay is caused by a combination of two things - the signal processing delay caused by the TFT electronics / scaler, and the response time of the pixels themselves. Most "input lag" measurements over the years have always been based on the overall display lag (signal processing + response time) and indeed the SMTT tool is based on this visual difference between a CRT and TFT and so measures the overall display lag. In practice the signal processing is the element which gives the feel of lag to the user, and the response time of course can impact blurring, and overall image quality in moving scenes. As people become more aware of lag as a possible issue, we are of course keen to try and understand the split between the two as much as possible to give a complete picture.
These are the top panels. As you can see, even the best panels out there who advertise 1ms response times are only capable of ~3ms combined lag times. As a rule of thumb, anything with a combined lag time of 10ms or under
MEASURED lag times can be considered a top tier panel suitable for all but the most hardcore, competitive fighter enthusiast.
That said if you are looking for a high refresh rate panel (a definitively better gaming panel compared to a 60Hz variant), it is best to first establish a budget. There are many great choices out there, but as always, it is pay to play.
What's your budget?