OK my suggestion:
Sell the mac
Sell the amiga
Keep the pc
Why?
1. The sale of the mac + the amiga should get you a decent amigaOne mobo (Or help you in that direction anyway)
2. The amiga one can run both amiga (of course) and mac (MOL) programs faster than any of these machines
3. The prices for pc hardware are falling everyday. So unless you got your pc REALLY cheap or are able to sell it to some morron you could only get ca. 60-70% of what you originally payed for it
This is ofcourse only usable if you are thinking about the amigaone and if you can bear saying goodbye to your amiga