What you asked about the ROMs would have been answered by a quick google search, so I figured since I don't know you and have not seen you post much you were new to the system.I am fully aware of the capability of my machine. I just thought you may be able to advise.
The machine already has a 20Gb hard drive upgraded by me.
Do not judge my expertise by one post ... not that I am complaining when it comes to Mac my knowledge is sadly lacking but I am not a complete idiot
I don't think you are a complete idiot.