The MCP655 / DD-D5/ Laing D5 (all the same pump) is a top quality pump that is one of the best performing pumps you can get.
The MCP655, MCP355, and AquaXtreme 50Z will most likely all perform better than the MAG II LE. But they all cost more. So, you have to decided what’s more important...price or performance.
BTW a modded MCP355 is arguably the absolute best performing pump you can get for PC watercooling. That includes Iwaki and other exotic options.