What should i buy next for my collection?

Hi

I'm looking for some recommendations about what i should get next for my collection. I get knives to use , mainly DIY /pipes / boxes etc etc I have roughly $250 to spend but now sure what to add. My daily is the Griptilian at the moment. I already have

Benchmade:

1. 940
2. Griptilian

Spyderco:

1. PM2
2. Delica
3. Lady Bug

Ontario Rat 2 I was thinking of maybe a 940-1 or Mini-grip but looking for any recommendations for other folders I should consider?

Thanks for help in advance!