I've edited my original reply with more info (price etc).

If nearly everything needed will be RJ45 jacks, then I find the style I have been using works well. The keystone ones come more into their own when mixing different connnector types. And as you say, for regrouping jacks as appropriate after initial punchdown.

I suppose keystone panels could be easier when adding more jacks as well? Not sure.

As for the double keystone ones (front/back RJ45s), I would wonder about the higher potential for poor contacts (double the normal odds..).

Cheers!