Difference in Solid state relays

[haramberries]

Hello,
I'm pretty new to this sort of stuff. to give some context, am planning to make a switch panel for my set up.I want it to turn on things like my monitors, computer, amp, lamp all through a switch pannel. With the monitors, I didn't want to take it apart, so I wanted to do it though the power cable. After doing some research, I found these Solid state relays. I wanted to make a small circuit so I could run a switch to the panel without the whole 240V, and instead, use 5v USB power or something. I wanted some help in choosing a cheap SSR for the job, there are so many of them ranging from a few bucks to $60+.

Any help would be appreciated. 
,Thanks

[Paul Moir]

Some SSRs will use a TRIAC as their switch element.  The thing about them is they continue to allow current to flow until it reaches near zero, when they switch off.  This is no problem for AC where the current goes to zero 50 or 60 times a second, but doesn't work for DC.  Those use MOSFETs or some other switching elements. 
Also, there are a complex matrix of overpriced industrial SSRs, expensive but very good industrial SSRs, inexpensive but good industrial SSRs, cheap but not good industrial SSRs and knockoff SSRs of each of these.  If you're a mass manufacturer you don't use any of these but rather implement the SSR design yourself. 
Also worth knowing is that the common failure mode of an SSR is to always power on.  Make sure that is OK with your use.

I think practically anything will work with what you're planning to control so far, but provide a link to which SSR your thinking of using and for what exact purpose for specific advice.

[Seekonk]

Also note that it is common for the AC modules to leak many milliamps and devices like LED lamps will not fully turn off or AC may still be present in the circuit.