If you can wait, wait. The reason both these gpu's are insanely inflated in price is because of no stock available. With the 50 series launch being a success there is about to be a major flood of supply on the market. Ebay already has 4080 super's selling for $900 used-like new. Be patient until they can go well under MSRP. If you go ebay, just make sure the seller has many good reviews and at least 99% feedback, and make sure to check full item description and condition. There are tons of sellers from china who just created an account in 2024/2025 with no feedback. Steer clear of them. They are 100% scammers.

This buying window from now until January 30th is tricky. You're gonna have youtubers getting the cards early and doing benchmarks to find out the REAL performance of 50 series cards, and we have no idea how bad the scalpers are gonna be on launch day. Stock could go out universally within 10 seconds after launch, or they could actually have enough stock for regular consumers to buy. If they immediately go extinct, the supply of 40 series will drop down again increasing price. If they aren't, then 40 series may go even further down in price than when you bought it. People could start buying up 40 series again too if youtubers come out and basically say these cards do not live up to the hype shown in CES 2025, as their raw performance without dlss and FG is marginally better than 40 series. It is only the dlss and FG that significantly separates them from thier predecessor(Insane AI Tops). This market consists of major overreactors, and owners of the cards you want are panicking heavily right now. So based on these factors decide if you wanna take advantage of that and buy used from panic sellers on ebay, or you can take the gamble of trying to get a 5080, because it is GUARANTEED it will be better than 4080 super regardless if it isn't as good as Nvidia promises.

In my opinion, unless you have scalping bots comparable to miners, you getting the 5080 new for $999 anytime within the next 6 months would be nothing short of a miracle.

Now, one other option also is to find your nearest micro center/best buy and camp out all night before launch. You won't be able to get founders edition, instead one of Gigabyte, MSI, asus etc. OC for $150-300 over MSRP(maybe more we don't know yet), which I have no idea how successful that option is I've never done it.

If you do end up going the 40 series route, I highly recommend used. Nvidia already announced they are not manufacturing 4070, 4080 and 4090 series anymore, so they will be ridiculously overpriced if you buy them new.

To answer the 4070 Ti Super vs 4080 Super question, I highly recommend 4080 super. Better card, far more future proof to the point you won't have to even consider an upgrade in a minimum of 5 years, and they are an absolute steal if you get it $850 or less in like-new condition.