What model Rasberry Pi 2,3 for Allstar

I’m running 2 nodes on several of the older PI’s and they seem to being okay but I wanted purchase and updated model but I’m not sure what model or CPU size would be adequate for my needs. I do know I want to get one with a fan.
Thanks in advance for your comments.

Raspberry Pi 3b+ will do the job. No fan required.

Yup p3 + I just had that on mine

I bought a clearnode without a fan seems great

Thanks folks I just like to confirm things before I purchase.