What's this "no depreciation" you guys talk about?
I paid £4000 for mine in 2010 - it's now worth maybe £500, if I'm lucky.
I've spent probably £1000 in maintenance (tyres, fluids, brakes, cam belt, rear shocks, oil cooler etc) which would have been a lot more if I were paying someones labour rather than blagging favours from people.
£1120 road tax.
~40k miles in that time at an average of about 23mpg, lets assume an average of £1.24/L, £5.63/gal, 1739 gallons equals £9790 on fuel.
So in four years it's cost me £15900 including fuel, or £5600 in purchase & running costs and it still needs wishbones, bushes, probably a gearbox flush and is starting to dissolve into iron oxide..
Or, spend £18000 on a new £30k motor over 3 years with warranty & servicing included, £30p/a tax and 50mpg, which equates to £18090 purchase & running costs and £22890 including fuel.
Seven grand more and you get to drive a brand new car with zero worries about reliability and if you want to take a european driving holiday you won't have to take an entire spare car with you (like James appears to be doing)!
The figures are even less favourable to the Omega if you do the sensible thing and go for a 1 year old car rather than brand new so you're not eating the initial depreciation..
[edit] Actually there's a problem with my calculation isn't there - it's not £7k extra as the new car is over 3 years and the Omega over four, so it's more like £9k extra over four years..