Yes, you should be able to use your planned GTX 1660 SUPER for a few more years. Unfortunately, it is out of production at this point, and is becoming much harder to find new. At that price point or a bit higher my current recommendation would be either a GeForce RTX 3060 12 GB (if you can find one new), or if you can't find it, then the RTX 4060. And yes, anything that's currently available brand new that's not an el-cheapo GPU would be a massive improvement over your current GT 710 (which, by the way, is now obsolete due to Nvidia ceasing further driver development for that generation of GPUs, leaving it with only security patches which will end this coming September). And because it is now obsolete, that GT 710 will permanently lock all currently available versions of Premiere Pro (23.x and later) to software-only rendering (no GPU acceleration whatsoever).
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