Most of these came from the Giant Sized X-Men boxset from Toybiz and were some of their finest figures IMHO.
Havok - Toyfare mail-in exclusive, was supposed to be released in the Toybiz X-Men series 2 but was cut from the lineup.
Colossus - from the Giant Sized X-Men giftset, nicely sculpted, very imposing
Nightcrawler - from the Giant Sized X-Men giftset
Storm - from the Giant Sized X-Men giftset
Cyclops - from the Marvel's Greatest Moments 2-pack, has a nice flip-up visor with light-piped eyes
Marvel Girl - from the Marvel's Gold series
Wolverine - from the X-Men Water Wars series
Thunderbird - from the Giant Sized X-Men giftset
Banshee - from the Giant Sized X-Men giftset
Sunfire - from the Giant Sized X-Men giftset