If you suscribe to Which? magazine you can look up their web site re 'Personal Finance Software'.
At their last review, a Which? recommendation was 'Moneydance 2008'. You can find out more about it via 'http://moneydance.com/'. A free trial is available.

I'm a Microsoft Money user and, like you, I've built up a considerable data base of home finance files over the years. The latest version of Microsoft Money is Money 2005. That is the last version and Microsoft withdrew all support for it last year. I think you can still buy Money 2005 via Amazon, or the like.

Moneydance 2008 is supposed to be able to import data files from Microsoft Money.
I downloaded Moneydance 2008 for a free trial and tried to import data from Microsoft Money but eventually abandoned the idea. There was too much manual intervention involved in the import conversion process. My use of Microsoft Money was too complex for the basic Moneydance import procedure. I concluded that it was too cumbersome to consider doing an import of historic data.

I would probably consider Moneydance 2008 if I was starting from scratch with home finance. Like Microsoft Money, Moneydance is a US product and UK users wouldn't have any use for the built-in links with US banking and stock market services. I think that Moneydance is still a current, fully supported product.

I have continued to use Microsoft Money 2005, without technical support or access to linked internet sites (for banks, stock markets and help files.) It seems to run happily under Windows XP and Vista.
It still provides a personal finance system with which I am familiar and a usable facility for my needs. It also still has a workable export facility into Microsoft Excel which I find very useful.

So far, I have been unable to find a better alternative (for me) to Microsoft Money.
I hope this is of some help?