We [Pale Purple] are in exactly the same situation - when we setup our company, we didn't know anything about accounting, and spent some time rummaging through various open source packages - none appeared to be easy enough to use, give us the confidence that it would work properly for the UK system etc and appeared actively supported.
So, like you, we're stuck with Quickbooks. We'd love to move onto something else... but for the cost of £80-100 per year, any move needs to be almost painfree (i.e. no manual data entry) and the application needs to be able to understand VAT and payroll 'stuff'.