I doubt I will ever overclock my video card. Is it true the main reason people buy GTS is because through overclocking it can make up for the increased cost? I read an article that said the GT and GTS are barely different and not worth the extra dough.
if u in tight budget. then get the GT. if it is bit flexible get the (g92) GTS. GTS is like the elder bro of GT. but he is not that old. but when it comes to who is cool. then the elder is the cooler one, n the chicks love him.
A dual-slot cooler will keep your video card and the rest of your PC cooler. It's up to you if that's important, but I think for the sake of durability, it should be on your short list of important things in a PC. So if you can, get a GTS 512 with the dual-slot cooler or a GT with a dual-slot cooler, but the GTS is faster too by a little bit so I think the cost difference is worth it.
No the performance between a GT and a G92 GTS is minimal at best, it wouldn't be worth it to either purchase another card again, or to step-up. Besides, the new cards will be here very soon, a few weeks.