Pro ~$399 4.2 Tflops
Slim ~$299 1.8 Tflops
Xbos ~$299 1.4 Tflops
Pro is the easy choice I think, except maybe for the few who are really into 4k discs or maybe have a Xb exclusive they really want. Pro is much stronger, has 1Tb Hd, can do Vr if you get into that, will probably upscale a bit...