Not necessarily similar but you might fancy those if you don't know them already:
Alamaailman Vasarat and Taal - http://www.progarchives.com/Progressive_rock_discography_BAND.asp?band_id=154 - HÖYRY-KONE (sadly out of print), http://www.progarchives.com/Progressive_rock_discography_BAND.asp?band_id=621 - SAMLA MAMMAS MANNA , http://www.progarchives.com/Progressive_rock_discography_BAND.asp?band_id=248 - MIRIODOR , http://www.progarchives.com/Progressive_rock_discography_BAND.asp?band_id=501 - ENSEMBLE NIMBUS , http://www.progarchives.com/Progressive_rock_discography_BAND.asp?band_id=1667 - PANZERPAPPA , http://www.progarchives.com/Progressive_rock_discography_BAND.asp?band_id=1275 - 4/3 DE TRIO , http://www.progarchives.com/Progressive_rock_discography_BAND.asp?band_id=597 - FRENCH TV , http://www.progarchives.com/Progressive_rock_discography_BAND.asp?band_id=2744 - SILO, LE , http://www.progarchives.com/Progressive_rock_discography_BAND.asp?band_id=2811 - YUGEN , http://www.progarchives.com/Progressive_rock_discography_BAND.asp?band_id=1010 - U TOTEM (the first album), http://www.progarchives.com/Progressive_rock_discography_BAND.asp?band_id=1521 - SLEEPYTIME GORILLA MUSEUM , http://www.progarchives.com/Progressive_rock_discography_BAND.asp?band_id=2041 - ESTRADASPHERE , http://www.progarchives.com/Progressive_rock_discography_BAND.asp?band_id=699 - TIPOGRAPHICA , http://www.progarchives.com/Progressive_rock_discography_BAND.asp?band_id=850 - BIRDSONGS OF THE MESOZOIC (Iridium and Petrophonics), http://www.progarchives.com/Progressive_rock_discography_BAND.asp?band_id=1931 - BEGNAGRAD , http://www.progarchives.com/Progressive_rock_discography_BAND.asp?band_id=1482 - FAR CORNER , http://www.progarchives.com/Progressive_rock_discography_BAND.asp?band_id=2623 - FUKKEDUK , http://www.progarchives.com/Progressive_rock_discography_BAND.asp?band_id=2168 - HAMSTER THEATRE , http://www.progarchives.com/Progressive_rock_discography_BAND.asp?band_id=2039 - INTERFERENCE SARDINES , http://www.progarchives.com/Progressive_rock_discography_BAND.asp?band_id=2447 - MIASMA AND THE CAROUSEL OF HEADLESS HORSES , http://www.progarchives.com/Progressive_rock_discography_BAND.asp?band_id=2149 - NIMAL , http://www.progarchives.com/Progressive_rock_discography_BAND.asp?band_id=2873 - UŽ JSME DOMA* , http://www.progarchives.com/Progressive_rock_discography_BAND.asp?band_id=2663 - WHA-HA-HA
for Stormy Six and Mago de Oz I find it a bit hard to give you more bands, but as for the Skyclad recommendation, I second it and would also suggest - Cruachan.
If you want more info and samples to listen to, you are more than welcome to PM me. 
------------- http://hangingsounds.blogspot.com/" rel="nofollow - Hanging Sounds
http://www.progarchives.com/ProgRockShopping.asp" rel="nofollow - PA Index of prog music vendors
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