For more info on your x86 amiga options look here..
x86 Amiga - Amithlon / AROSWhilst amithlon can't be bought or downloaded, (it can be obtained by other means) provides better compatibility then aros and is continually being updated to work with newer hardware!
AROS is free and it's open source!!! anyone can contribute!
visit
http://www.aros.org/ for more info!