Hi TapouT
We use Sage Line 50 - with several bolt ons (around £5k worth of Sage software in the end). They were offering interest free over twelve months on a lot of their stuff too. We chose it in the end because we needed a fairly robust system, which would link to other things like Excel, CRM, job costing and so on. Our accountants also had an input into the decision, as they're (theoretically) the ones who will end up sorting out the mess we make of it!!!!
They do offer a free version too, as someone has mentioned - I think it literally just does invoicing and nothing else.
Depending on your needs, you could simply use Excel or something, by setting up a template, and saving it each time with a different file number, and then running a fairly simple "day" sheet to reckon your income and outgoings - there really isn't any point in having accounts software for the sake of it.
Sage do a small user accounts package too - Instant accounting, and that seems to be worthwhile for any small business with a turnover under say £250k, again, depending on the functionality required.
I have to say that I got put off Quickbooks some time ago - they had a big presence a few years back, then just seemed to disappear. It seems they're back now though - and it also seemed very "US-centric" for my liking.
Can't say I've heard of the one you mentioned - but with Sage, certainly, once committed, it won't ever lose a thing (not even the odd penny off the VAT!!!).
Key criteria ought to be: reliability, support, functionality, ease of use.
It really depends a lot on what you want to do, the volume you need to produce, and what you need to do with the data once you've entered it.