Hi Mike. I used Krone blocks back in the mid 90s. I really liked them.
I'm afraid now your long-term options now are probably straight old 66 or 110 blocks. 66 blocks give some added flexibility. 110s are more efficient as far as space consumed compared to 66 blocks. Krone and 110s have a very similar profile.
Depending on how much copper you're terminating, you may want to plan the frame layout for cross-connect field space before building the frame. You don't want to end up with too much cross-connect wire volume in too small an area. That can get troublesome.
Happy to discuss specifics. Just ping me off-list.