Help me pick a GPU for my setup

[slyexe]

Thanks slyexe. I realize these are noob questions, but appreciate you helping out.

I see there's a ton of different 3080TI cards on Amazon, only some mentioning NVIDIA. As I'm using NVIDIA driver, do I need to pick one of those? What's the differences between the different 3080TI cards, and does it matter from a cracking point of view?

All 3080TI are Nvidia cards and will use the same driver, the manufacturer will only be different. I have several EVGA 3080TI and they are among the best for maintaining their temps compared to other brands such as ASUS & MSI in my opinion. The difference between them would be their base core clock speed & style of cooler which would have slight alterations to your hashing speed. In the relation to core clock between cards it will be so significantly small that you'd most likely be cutting a few seconds off each hashcat session and in your case, being a hobby, wouldn't really be critical. 

I would also suggest checking your local PC parts store or online marketplace (fbook, craigslist, etc) as now that the market is flooded with 3000 series cards you may be able to snag one below MSRP pretty easily.