Upgraded A500s are cool
.
A 1084 or CM8833 monitor would go nicely with an A500. I missed my CM8833-II since it broke. Machines like the 500 will still work on the Microvitec 1438 but it isn't as good.
Can't say I'm familiar with any CF stuff for the 500, but flash memory is avaliable for just about every other old computer these days, so you can probably get something. I just have my GVP HD+ with its 50MB Quantum SCSI drive. That works nicely and still has plenty of space on it. Only downside is that it is noisy.
I'm going to put a CF card in my A1200 as soon as I've bought some adaptors.
Which PC emulator do you have?