I use a PC accounts application in simulation: Money Manager,
It's inexpensive, compact, powerful, reliable, flexible and rigid in all the right places for me. ( the boss developer is very stern and old-school - wants it done just so :-))
Historically this is because I started using it on Atari, then, when that went bellyup and I switched to Mac ( for music), I began using SoftWindows for continuity of records. ( now Parallels and rockin')
I've looked at the new Mac programs, admittedly not in depth, but they are either too simple ( no VAT) or too complex.
http://www.moneysoft.co.uk/index.htm
hope this is of interest
peter