Finally made the decision to get serious about MAME software lists and have made good progress (thanks largely to Mucci's sooner posts!), but seem to be hitting a wall where PSX CHDs are concerned.  There are a multitude of collections in various formats on Internet Archive and elsewhere  (bin/cue, CHD, etc) which seem to contain what I am looking for, but after trying dozens of them in some cases and not getting a single CHD that passes muster with ROMVault I am reaching out to the collective for advice.
Can anyone point me to a collection which has a higher hit-to-miss ratio for MAME-friendly PSX files?  I am not afraid to put in the effort or build CHDs from bin/cue files, but am growing weary of downloading TBs of data with nothing to show for it.
Thanks for any and all advice you may have!