What GPU to buy last?

Hey everybody, I’m completing my first mining rig and am rather new to the hobby. RVN is certainly my favorite coin and I am looking to finish off my rig as I have 5 cards and space for 6!

 I have the following: 

3x 1080ti EVGA HYBRID 26MH 80%P 1x 2080ti EVGA HYBRID 37MH 80%P 1x 3080 EVGA ULTRA HYBRID 47MH 70%P

 I want to keep the rig in the EVGA HYBRID realm. I’m really open to buying any card. The 10 series cards are getting a bit old and I’m really a fan of the 3080. So I guess I’m leaning towards another 3080 or 3080ti should I somehow find one for a more reasonable price. Potentially a 3090 but the prices seem too outrageous for $/mH comparison. So maybe the decision is between another 2080ti or 3080. Some of you may think it’s dumb to have such a stringent “theme” to the rig but hey it’s a hobby and the EVGA cards are very high quality. I do know of a 3080 I could buy for $1100 but it’s air cooled and another brand. Great for my next build I suppose! But I’m being stubborn on the brand as it’s my baby rig. :) Anyways, any and all suggestions are welcome! Including totally different questions or anything.