Re: What would you buy?
Yes Asus is a good brand, shop around for the good deals.
You want to look for these specs:
At least 2.0 GHz CPU, at least 2GB of Random Access Memory
The onboard video chip will be fine for your type of work
As for storage, a Westen Digital (WD) 2TB Hard Drive or two 1.5TB should be fine for all your accounting needs.
I recomend Microsoft Windows XP Professional as it is compatable with old (about 10 years ago) software.
You wont need a fancy screen, even a old CRT screen will work, as long as the Blue D-Sub cable can plug into the back panel.
This might cost you around 300-600 NZD.
Hope this helps, can anyone else add some more info?
P.S Also ask to look at a Entry Level PC, with the specs I gave you.