Since nobody has answered you yet, I'll jump in on this.
105 degree caps will keep their tolerance longer since they hold up to heating changes better than the 85 degree caps. The other thing to consider is the ESR which I think is a little higher in the 105 degree caps unless you buy a specific type that has low ESR.
While I don't think either should affect older monitors built in the 80's, if you have a newer monitor or tri-sync, it may be required that you get an exact replacement.