I got to say - you've found some peaches there on ebay.
The TD one looks great - especially if the bloke is going to sell all the bits for £100 to do the conversion (someone will have to ask him what he means by this as there's a lot for the TD - turbo, inlet/outlet manifolds, sump etc).
The seat van looks a bargain for £300. To see it running (and the fact its only got 97k on it) is worth a lot of money -in the past i've spent £200 on low mileage 1Y's that i havent even seen running (i was lucky). You could even sell those alloys to get some money back (you wouldnt keep em lol).
I wouldnt bother with the spares or repair 1Y - look around hard enough and you can find a runner for £100.
You have to love the simplicity of the 1Y conversion - its so straight forward and reliable.
However, the AAZ is simply brillaint - but its not without its pitfalls. I've already had to change a turbo and been recovered due to a snapped oil return pipe to the turbo. But i do 20k miles a year and the TD is soooo much nicer to drive. I love it.
My usual advice on this subject is "if it aint broke dont fix it" because the increase in power that the 1Y gives isnt that impressive (well - i went from the KY 1.7d which i loved) - but for a cheap fix its great. However, if you have a bit of spare cash and fancy a grin - then go for the AAZ conversion.
I drove the 1Y for two years (two different engines - i blew the first one up with the same dodgy oil pump that blew my 1.7 up) and it was great. Very nice to know you have a spare in the garage too
Good luck with whatever you do - there's plenty of info on here. Dont be shy if you want a chat - PM me for my number....
Ringo
Now driving a big bad VW LT Florida.