We have a customer who would like to have his 1.000 CDs with classic music tagged only with GD3.

Is there a limitation of GD3 lookups when ripping with Batch Ripper and Nimbie?
Can I handle this limitation by ripping manually with CD drives (dbPowerAmp)?
If I have to buy GD3 "lookups". How can I handle this with dbPowerAmp?
Or is there no limitation?