The cheap Monster and Furman are not so great.
Once you are up in the 7000 level Monster that is OK.
I still own but do not use both a Monster 5000 (which could be had used for $200. And a Monster 7000SS which is worth about $550 used.
I currently use two conditioners in my system.
A PS Audio P600 set to output 110hz instead of 60hz, for all the digital stuff.
And a Furman REF20 I for all else.
Bought both used.
IMO if you are going to go for a Monster, go for the better ones. A 2600 is pretty cheap originally, so it is not such a deal used. Worth $75 at best used.
I'd sell my 5000 for $200 anytime.