The layout of this guide is terrible - it's hard to tell what text goes with what album - but the suggestions are solid.
Brendan Perry's songs match my mental picture of goth rock on that first Dead Can Dance album specifically, to the point that I'm wondering if you've only listened to their later albums. Lisa Gerrard's songs fit in smoothly, the album to me feels like goth rock with neoclassical interludes. The best Brendan Perry song on that one is track 8 (A Passage in Time), give it a listen and tell me if I'm crazy for thinking that's exactly what goth rock sounds like.