Here u go, this link to US client.
When u d/l-ed, setup it but dont run, do not let it patch!
This just the client english(item's/stats/mobs/etc)
The other things like (NPC names/System messages/etc) depends on instant server file you use,
i didnt find yet any "english instant server file" so i use rain's one... but i got many files in my lang that i translated to english.
Hope you understand my post, if need any help send me a PM and ill try my best to help you.
Sorry for english,iam a proud Hungarian!