Trouble finding suitable Op-amp
First, notice that in your circuit, the input voltage to your op-amp is only half of the V1 value. So if V1 is never more than 60 V, you really only need an op-amp capable of taking 30 V inputs. However, beware of "unusual" conditions like powering up and powering down --- you should be sure that the op-amp powers up before the input sources if you want to use this fact.

Second, op-amps with high voltage capability aren't that hard to find if you know where to look. I did a quick parametric search on linear.com and found several that will operate with more than 40 V between the rails. LTC6090 supports up to 140 V between the rails (+/- 70 V). It is, however, not a 25-cent jelly-bean part like the '741. I see pricing starting above $5 per part on Octopart. 

Edit

Adapting my answer to a previous question, if I understand your overall problem, you maybe can do something like this.







simulate this circuit &ndash; Schematic created using CircuitLab

Here the comparator (OA1) never sees more than 6 V, so could be operated from 10 V supplies or so. You could do an even more extreme divider ratio to allow you to use a 5 V comparator, but the tolerances of the resistors build up more the lower the divider ratio. You'll probably want to use 1% or better resistors here even as I've drawn it. 

The other thing to be careful about is looking for MOSFETs for M1 and M2 that will switch fast enough for your application. The value of R5 will also affect switching speed.

Edit 2 
I show a resistor divider between M1 and M2 in response to your comment.