I'd go for Walls of Jericho, Bleeding Through, Unearth, Hatebreed, i've never seen hatebreed live
One tip, stay away from the big guys, and don't be afriad to hit people, cuase they will hit you. and the most important peice of advice, stay in the pit for all of Unearths set.
My radio co-DJ went to a hate breed show the day after breaking his hand into about 5 pieces. He had his cast signed by teh entire band and everything. He put it as the second best show hes ever seen right under Metallica.
ozzfest went to shit yrs ago, i think the best lineup ever was back in like 99-00 or so with bands like deftones and slipknot and black sabbath, and wasnt pantera there a few times too? i used to love all that shit back then