Erm... I'm sorry to announce that your voice cast is wrong (mostly). Heh. The following is a list of the English voices and a slightly in-depth explanation about the most interesting in this list.
Steve Burton as Cloud Strife
Mena Suvari as Aerith Gainsborough
Quinton Flynn as Reno
Rachael Leigh Cook as Tifa Lockhart
Steve Staley as Kadaj
Wally Wingert as Rufus ShinRa
Beau Billingslea as Barett Wallace
Benjamin Bryan as Denzel
Bettina Bush as Elena
Chris Edgerly as Cid Highwind
Christy Romano as Yuffie Kisaragi
Crispin Freeman as Rude
Dave Wittenberg as Yazoo
Fred Tatasciore as Loz
George Newbern as Sephiroth
Grace Rolek as Marlene Wallace
Gregg Ellis as Cait Sith
Jamieson Price as Reeve
Liam O'Brien as Red XIII
Rick Gomez as Zack
Ryun Yu as Tseng
Steven Blum as Vincent Valentine
Steve Burton, Mena Suvari, Rachael Leigh Cook, Andrea Bowen, Benjamin Bryan, Bettina Bush, Chris Edgerly, Christy Romano, George Newbern, Gregg Ellis, and Ryun Yu have no prior
anime dub expereince.
Steven Burton has been acting since 1987 when he debued in "Out of This World" as character Chris Fuller. His latest acting role was in mini-series "Taken" as Captain Russell Keys. He's reprising his role as Cloud Strife (he was the English voice of Cloud in Kingdom Hearts and Kingdom Hearts: Chain of Memories).
Rachael Leigh Cook debued in "The Baby-Sitters Club" as character Mary Anne Spier. She's since risen as a rather popular female actor and is featured in many popular movies (none of which I've seen because I don't like her). She has some voice acting experience as Chelsea Cunningham in the Batman: Beyond animated series.
Bettina Bush has, pretty much, only a voice acting career. You'd probably recognize her most as Alisa Carmicheal in "Rugrats" or Gloria in "Madagascar". Her latest role was Nonahkee in "Age of Empires III".
Beau Billingslea has been in the acting scene since 1971 and debued in "Child Abuse" as a Detective. He's acted in such TV series as "Matlock", "MacGyver", "City of Angels" and "The West Wing". His voice acting career has been absolutely extensive and rewarding; he is one of the best and most popular anime voice actors in the United States, having worked in such anime as "Cowboy Bebop" as Jet Black, "Outlaw Star" as the Narrator, and "Gungrave" as Bear Walken. He's done so many anime and games I can't mention them all...
Crispin Freeman has had an extensive voice acting career in anime himself. He's been staffed on quite a few as well, being an audio engineer. His roles in anime include the entire ".hack//" series (including video games) as Balmung, "s-CRY-ed" as Straight Cougar, and "Slayers" as Zelgadis Graywords.
And finally...
Steven Blum is probably THE most popular anime voice actor in the US, followed closely by Wendee Lee and Beau Billingslea. Steven Blum has done voices for so many anime, games, and movies that I'm surprised that he's even still alive. His more popular anime have been "Cowboy Bebop" as Spike Spiegel, "Big O" as Negotiator Rodger, and "s-CRY-ed" as Kazuma. His non-anime roles include TOM-2, the Toonami announcer robot, Jamie in "Megas XLR", and Ares in "God of War". He does commercials too... Subway, Seven-Eleven...
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I also found it rather humorus that Paul Dobson was errored to be the voice of Sephiroth.
. For those of you that don't follow anime, or just simply don't know, Paul Dobson is the English voice of Naraku from InuYasha. What's funny about this is that the Japanese voice of Sephiroth is Toshiyuki Morikawa (the Japanese voice of Naraku).