Well for me, X-Dream - Panic In Paradise.
It's crossover of g' ol' goa and darker soundscapes that only X-Dream could execute.
All the tracks are carefully chosen and do not appear on other X-Dream's cds (or am I wrong?). This is ear-candy for any psyfan, from darker industrial grave diggers to fluffy goa candy ravers.
You can see it's well, "rare-ish" in discogs, BUT on ebay.de you can find it for 10 euros. So it's normally priced jewel, no-one should miss this!
Definitely something you can't get bored at very easily. In fact, the more you listen to it the more you "discover".