alderlake '23

I've had this question bouncing around in my head which annoys me.... I've been wanting to build a "New" to me PC, Could I build/source a i9 12900k + RTX 3090 Ti (EVGA FTW3 Ultra Gaming) PC but I wasnt't sure if I should build it with a ~$2,850 budget (New) or go find a used one then swap out...