3.0L TDI (BKN) Piston ring recommendations?

[OliNix]

Pretty much as the title, engine is fully stripped so going to replace the piston rings and bottom end bearings. Audi want £1200 for the bearings, bolts and piston rings!!!

This is obscene! Does anybody have any experience of using aftermarket versions? Costs? Source? Etc...

Thanks in advance!