I bought a Powerflow stainless steel exhaust system (yes steve_earwig, I'm whoring Powerflow again, and no, I'm not getting paid!

) for my 1.8 petrol.
It cost £320 (designed, built, fitted, inc. VAT), which was more than £100 less than what I was quoted for an original Peugeot exhaust system.
The stainless steel system will outlive the car. Furthermore, Powerflow provide a lifetime warranty on the system, for as long as you own the car, and as long as you take it back to your Powerflow dealer for a quick free inspection once a year.
There's some 2.2 HDi owners on the Coupe Club who have had stainless systems fitted. Sure, you can get a sporty exhaust note from a Diesel - you need to tell the dealer that you want a sport sound from your exhaust.
The only caveat is, you gotta tell your insurance company you've had one fitted, as they're seen as performance modifications - even if, like me, you only fitted one because your original system had gone to pot and it'd cost more to put another rot-prone system back on the car.