I bought rebuilds since the internal parts of an injector do wear out over time and no liquid (diesel purge) will fix worn out metal parts. I would definitely invest in new injectors since they are not that expensive anyways. Then make sure you send them out to be adjusted and tested. Once you put them on your car you will not believe how much better your car will be running. You definitely will not get that with diesel purge...... trust me; I did both.

Look at some of my recent threads as I even have pictures of the old and new injectors. I was going through the same dilema that you are in now so learn from my mistakes. Screw the diesel purge. Don't get me wrong as I still use purge every few months but I will not use Diesel Purge to rebuild my injectors.

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Audi TT