According to the details on http://amiga.resource.cx/exp/impact500mk2 , this unit will accept up to 8Mb of RAM, but I felt I should check on here exactly what types of RAM are compatible. I seem to remember that 9Mb RAM is the limit for an Amiga A500 Plus. Where is this RAM available fairly cheaply?
Congrats :-) The 500 plus has 2MB chip RAM and you can have up to 8MB Fast RAM.
You can then get an accelerator and as long as it's ram is in the 32bit space the sky is the limit when it comes to RAM.
With accelerator's you do have to be careful that they will work with some sidecar expansions so it's worth a google before getting one.
The GVP you have supports SCSI drives, I'd buy a mechware SCSI card reader and then you can use CF Cards for your HDD which makes it really easy to setup under WinUAE on your PC :-)
http://a4000t.com/store/index.php?main_page=product_info&cPath=65_79&products_id=243With your GVP it supports up to 8MB and has 4 x 30 pin SIMM sockets so I'd get 4 x 2MB 30 pin SIMM's which would give you the max 8MB RAM.