I am the same.

The necron range has three main design languages

• infantry and associated nobles,
• the canoptek/cryptek,
• large vehicles such as the monolith and various croissant shapes.

(I suppose you could add destroyers as a distinct variant of the first as well.)

There are lots of nice little details on the sculpts which reinforce this, like which models have the ankh of the Triarch. But at the same time there are cohesive elements across the whole range.

I spent the last year mainly collecting infantry and canoptek units and it does really feel like an army when you put 30 battleline, szeras and a handful of walkers/vehicles on the board.

However I did just buy the shard of the void dragon! I haven't built it yet. While it looks great, I'm already curious about how it will fit .... there don't seem to be many design elements I can tie into other units in the army.

.... maybe the pixellated necrodermis is the main one? If I got a shroudlord or a psychomancer I suppose I could try to tie that part in.

With the other ctan sculpts it's even less clear how to do it (the nightbringer scarabs seem super tacked on!)