Hello Ruello.
I hope that you've done some research. You would realize that nothing as far as concerning the technology connected with the name "Amiga" is actually new. Your choices are the classic models based on the 68000 Motorolla architecture, and the "modern" PPC and variants as far as getting the actual hardware. If you've looked at the retailers listed in the company section at the bottom of the page, you'll see that there's very few of them, and only a few offering newer equipment.
If you want to give the operating system a try without investing in the hardware, you can buy Amiga Forever, or download WinUAE and install it on any PC and you'll have a bonifide "Amiga", which will run most of the programs made for it with only a little tweeking.
Don't wait for AOS4.