Thank you ever so much XDelusion for the informative reply, I wish I can give you kudos for that.
I have lost touch with the Amiga for at least 20 years and only recently decided to go retro again and relive my younger days.
I have actually bought myself a good A1200 off eBay recently, but since then read that I need additional memory/accelerator to run WHDLOAD in order to run the older games/demos. Looking at the cost of these upgrades (between £70 - £125, memory/accelerator), I thought I might spend that money instead on a Mac mini or Powerbook instead and run MorphOS, hoping it will run the old demos/games, but I also want a dab at the native apps for MOS.
I may still go down the route of MOS since I already have an A1200, although just standard 2Mb, I think it will do the job.
Once again, many thanks.