an FSi owner speaks!!!
I'm not advocating one over the other, in fact I was in exactly the same boat prior to buying mine, Fsi vs Tdi.
I was slightly at a disadvantage in that my previous car (Alfa 156 V6) required around £800 to keep it going through the MoT, and I was not prepared to spend this. So I did a deal just as the tax was running out and part-exchanged it against my FSi. Had I more time, I would have spent longer looking around.
My mileage is low-ish so I was not in need of the extra economy per se. I do less than 12,000 miles per year. My insurance is £300 fully comp and the tax is £100.
I have driven a Tdi 75 and I liked the mid-range torque. It also had a "throaty" sound to it. But if you prefer quietness, then an FSi is fairly. Mine averages 42-45 mpg on Shell V-power. If the UK ever receives the special low-sulphur fuel the motor was designed to use, then perhaps we'll see lower fuel costs but it is unlikely. That said, diesel is more expensive (than regular unleaded) so you'll have to weigh this in to any equation if fuel bills are a major factor.
But as you say, Tdis are around £1000 more like for like, and that buys a fair bit of petrol.
I do not regret buying an A2 at all. I like it a lot. I'm looking to possibly change it for a higher spec and I will consider a Tdi or an FSi again.
Either way, you pays your money and takes your choice. If you have the opportunity to drive both, then perhaps that will swing it for you. But if you cover a low-ish mileage, then an FSi will serve you well.
Discuss!!!!