Well if your going for big power then my guess is the bam is the one but anything over 300lb ft torque will probly need forged rods, so if your just aiming for a nice 220-240bhp then any ayp aum agu from a leon cupra or
ibiza cupra or gti turbo will do the job?? The cost difference between buying a bam to buying any other 1.8t engine is a fare bit...any of the ithers can be had for around £150-250.