Linux For a Normal Windows User

I have recently started a busness where I go around and fix peoples computers. The other day I was fixing a computer for an elderly couple, there computer is a p3 850mhz 256RAM, intel integrated gfx card, running win ME. They basicly use there computer as a word processor, spreadsheet program and quickbooks(tax program). Win ME keeps breaking on them and they really want to get off of it but have a limited budget. They were trying to get a cheaper price for win 2k and office 2k(they only had word 2000 and exel 95) since they were teachers and they still know many teachers through the teacher discount thing, but it didnt work out. They left a message for me today to talk to them about Linux and OpenOffice, since I had showed it to them when I was fixing there win me machine. I think they could handle linux, I would put fedora on and teach them gnome/open office. My ownly real concern is quickbooks, does it run through wine/winex? What does everybody elses take on this?

nuke