Looking back, the fact it's not as polished and refined is exactly what's so great about it. But those sounds have also been explored a lot so to release stuff today using those sounds you really have to come up with something unique or special.
I've got a large back-catalogue of old-school Techno/Trance/House and for me there's no need really to seek any more new stuff. Sometimes I hear a tune and note the name to download it but since 2002ish I mostly seek out new unique music now like Clarke, Milanese, MGMT, Air, Black Moth Super Rainbow.
I'm not an everything was better back in the day moaner except for dance music. But like I said, have a great collection of old school, plenty of new cool music coming out and come across the occasional gem of a dance tune that has that old school vibe.
By the way have you heard Leftfield's new album Alternative Light Source? It's not the exact type of sounds you mentioned but I reckon you'd like it.