1084 CRT = Forget about it, nostalgia reasons only.
Indivision ECS + Latest core + RTG emulation = Drool
It's an amazing upgrade, couldn't get enough of it using it with my A500 plus (well once the two fixes were applied to it). I haven't looked back.
Colours look amazing, and the screen is amazingly clear/crisp. Games look great.
Only reason I don't use it anymore is I have an Indi AGA Mk2 for the 1200 :-)