My new Pi recently got delivered, and I couldn't be happier with how it performs. That being said, not sure it'd have the grunt to emulate an Amiga suitably, considering the emulator itself would take up quite a bit of overhead.
Hoping a bulletproof, full featured version of AROS springs up for the new Pi. The new Pi runs Linux like a champ, and Win 10 embedded will be free for it.
Comparing the new 4 core Pi to the B I was using is like night and day, usability wise. The new one isn't a speed demon by any stretch, but I can honestly say I can use it on a daily basis for the basics of web browsing, word processing and other office stuff, social media, email, light multimedia usage under a full GUI environment without it being at all painful. Best $35 I ever spent, tbh.