Mac is a good choice, IMO. Bought an Intel based Mac Mini for the old lady and she's quite fond of it. I'll probably get a PowerMac once they convert to Intel too.
BTW just a little nitpick. You say you are tired of retro computing, because they (AOS and clones) don't have modern apps? Me thinks you miss the point of "retro computing". Either you are looking for a modern AOS(clone), or a retro system. Modern AOS(clones) are quite lacking, retro systems (1000 - 4000 etc) are still out there and as retro as you get.