Should I risk buying 11 yr old RS6 80000 miles

[smwcew]

I've been through all the cars I've wanted and there are loads I wish to avoid. I test drove a 11 year old RS6. It gives the power I'm used to (sort of, albeit it in a rather sedate way), but I don't know if it's a risky buy.
I'm told gearboxes go at about 80000 miles - just where it's at. Clutches, cam belts, etc. I'm also told bills will be v expensive.
I don't want to buy a car that going to do nothing but cost me money.
Any and all advice gratefully received.
Thanks, Susan x