I love psych from the 60's and early 70's. The Nuggets comps are very good. I also like the Psychedelic State series that
Gear Fab issues.
The Psychedelic Crown Jewels series is excellent and I'm planning to pick up
Psychedelic States: Indiana In The 60's soon.
For those who want to dig deep into the psych vaults, the
Psychedelic Pstones cds of UK psych are very much worth hunting down.
Bomp records carries a lot of these great collections.
Nuggets chief rival and probably better in featuring obscure songs (though not in sound quality) is the
Pebbles series. A 28 volume series that first appeared on vinyl, most of it has been transfered to cd. But even the songs with poor sound transfer have a fun raw edge that's to die for.
There's quite a few excellet comps that mix psych, garage and beat, such as Nick Saloman's
That Driving Beat series,
Chocolate Soup for Diabetics, various Nederbeat collections (Dutch beat/psych/garage/R&B) and the
Love, Peace & Poetry series which highlights psych & garage from all over the globe, one region per album.