I tink those three TPBs cover it:
Forging the Sword (http://www.amazon.com/Excalibur-Vol-Forging-Sword-X-Men/dp/0785115277/ref=sr_1_14?s=books&ie=UTF8&qid=1309699601&sr=1-14)

Saturday Night Fever (http://www.amazon.com/Excalibur-Vol-Saturday-Night-Fever/dp/0785114769/ref=sr_1_23?s=books&ie=UTF8&qid=1309699601&sr=1-23)

Prelude to House of M (http://www.amazon.com/House-Excalibur-Prelude-Chris-Claremont/dp/0785118128/ref=sr_1_19?s=books&ie=UTF8&qid=1309699696&sr=1-19)