lol
Well that's a nice domain to be sure, but if you do use it (unsure about copyright status) you'd better put some veneer resembling the magazine over the site, otherwise it'd be wasted... :)
Just my personal opinion:
8-bitgames: fits, if you are doing for multiple systems. If you want to do Amstrad only, it's a bit misleading.
AmstradAction: always has the risk of legal issues. might also be misleading, especially if you can't use any of the AmstradAction style.
AmstradReviews: would be my personal favourite from those 3. Easy to remember and spot on the purpose of the site.