Damn R0H1T I'm glad you posted in here. I'm definitely leaning towards the Benq you recommended then. Just a few more questions if you don't mind.
Does having a refresh rate over 60 hz make a difference? How so? I can't seem to get a straight answer.
Not really, tbh a constant stutter free experience at 60Hz is better than x fps more at 120Hz & this is why we have tech like the Vsync, free sync, Gsync et al. The higher refresh rate also requires more GPU power, roughly 2x if you want more fps with displays like the BenQ RL2455HM. Now I'm not saying that you need to run games at 100fps on such displays but it's no point going for higher refresh rates if you get better/smoother experience at 60Hz but since I haven't used such displays I can't share any personal experience in that regard.
Is there any benefit to eye sight in terms of using a 24" monitor over a 27"? 27 is pretty big, I'm wondering if I'd feel like I was looking at the sun, even if I was far enough away haha. Monitors have given me eye strain before.
No, the display resolution &
DPI scaling matters more but you can partially get over the 27" big screen problem by placing the monitor two (or more) feet away, from your normal seating position, if it ain't an impossibility. I have a 22" full HD display on my desktop set a foot away & I occasionally use my 32" 1080p HDTV with my laptop, set five feet away, but even a couple of feet away is fine for the HDTV as I've gotten used to it. The point I'm trying to make is that a bigger screen ideally should be set at something like two feet from you, the distance varies person to person, but once you get used to it you can set it nearer or farther as you deem fit in the future but yes it takes sometime to get used to at first.
Is there any reason to wait? Is something big coming out soon? I have an AMD card so I don't know what I could get out of G-Sync, or if G-Sync is even going to be that important?
Gsync limits you to TN panels atm & will always require the use of Nvidia GPU's in the future. It will undoubtedly make for a better gaming experience but ultimately will limit your GPU/monitor choice & it'll always be a more expensive proposition. The thing for you to consider is whether to get a good monitor now or wait for better/inexpensive monitors with Gsync to be introduced, at some point in time in the future, & be tied with Nvidia for x number of years or if you prefer Nvidia (& won't defect to AMD for the lifetime of this display) it makes you're job that much easier.