What ever you do don't up grade to 2008 unless you have to. We upgraded in Oct 2007 and because of VAT issues (Intuit said there were non) we carried on having to use 2005, this was Inuit's suggestion then as 2005 was no longer supported they sent us for free a 2006 upgrade. During January there was a patch issued, R3, which enabled us to us 2008 version, great! Then we discovered that templates were not transferable to the upgraded version, rewrite all our templates, as they're quite complex, 2 days work then discovered on delivery notes and quotations no matter what you do the vat rate is always listed. I could go on and on about other issues, such as not being able to reconcile in chronological order etc. Our only answer is to switch back to using the old unsupported version and use other software for PAYE or swich to Sage on our new financial year.
When we used 2005 I would and did recommend Quickbooks but not now, so if you want stress free accounting don't up grade to 2008.