I'm guessing you're using a 1.6L
win_equipTD on here has a 1.6L in his B3 passat. It motivates along well enough, but feels heavy with a load of passengers.
I'd recommend putting the smallest turbo you can find on it.
A K03-003 would be perfect. What a 1.6L in a heavier car needs is immediate spool up. It'll make the engine feel bigger, having full boost by 1500rpm. I believe QuickTD has run his at an intercooled 18 psi for some years now. My syncro's K03 is set to 14 psi, no issues. A T2 or K14 would be second best, but stay away from T3 k24 unless you're wishing to live with the irritations of running a laggy car with a 1000rpm powerband.(unless you're running a Giles Pump)
For a daily driver, keep the turbo small!
My syncro will accelerate up a steep hill from 2000 rpm in 4th gear! That's the K03-003.
Steal the glowplug system from an A2 and install it. The black, two-pin temperature sensor will plug right into your coolant flange, and the relay's cheap. I even went so far as to wire in an LED on my gauge cluster for glow plugs.
I ran out of time, and didn't install the cold start advance system. It wouldn't have been difficult though. Instead, I've just bumped the pump's lever to the advance position and left it there. She's a little more rattley at idle, but no harm.
Keep the fuel pump circuit intact and drop the pressure.
here's how I did it:
http://vwdiesel.net/phpBB/viewtopic.php?t=12727&highlight=fuel+pressure