My favorite set from the Burning Crusade era is actually not Onslaught

First up, there's the classic warrior tiers available via simply going and blowing up the raids - the Battlegear of Might, the Battlegear of Wrath, and the Conqueror;s Battlegear. You don't need a strategy of any kind here - if you're level 90, any and all of these raids should simply melt, with the possible exception of BWL being annoying thanks to Razorgore's mind control mechanic.Cheap WOW Gold On Sale.I've done it solo, but it's still a pain. There are several non-set plate pieces that drop in MC, BWL and the AQ's, so remember to keep your eye out for them. You may be used to trashing pieces with int on them - it's a habit we get bred into us by the game - but for mogging, as long as you can equip it, it doesn't matter what the stats are. So always make sure that int gear isn't a look you really like.

Some of the best regarded warrior sets are from The Burning Crusade and Wrath of the Lich King, and all that stuff is pretty easily soloable too. (I find Gunship 25 annoying to solo, so see if you can talk a friend into helping there, and you'll need a healer friend for Dreamwalker in ICC - can't be done without some way to heal her) - I find that the higher end Wrath bosses require a fury spec with Second Wind so that you can burn through the damage. (In general, if you're soloing old content for mog gear, Second Wind is a lovely talent.) My favorite set from the Burning Crusade era is actually not Onslaught, however. It's this blue recolor of Onslaught, much (but not all) of which is available from raiding Black Temple. For a warrior, the Vengeful pieces are a lot easier to acquire (they cost honor points from the vendor in Area 52) and only warriors can equip the shoulders and chest - there's no non-PvP options for those pieces. There's a lot of great options for you in these two expansions - the Siegebreaker from Ulduar (in up to four colors, too), the Destroyer from Tempest Keep and Serpentshrine Caverns (and its recolor), the Horde and Alliance specific armors from Trial of the Crusader (most of which are available for purchase outside the raid itself for justice points) and my personal favorite the Sanctified Ymirjar Lord. It's also possible to match other class sets, if you want to - there's a ton of plate that matches DK and paladin gear (and some that matches warrior, as well - but no pieces match the red Sanctified Ymirjar Lord, you can only get that look as a warrior.)