Currently the top gear is in the 40-man instances,they are not really hard,just time consuming and need a huge community to be able to organize 40 people and the right classes.
Zul'Gurub ,a 20-man instance,actually has also some awesome gear after the recent upgrades,its not too hard and waaaaay more fun than Molten core or Blackwing Lair.At least Blizzard has adressed the problem lately of many guilds disappearing or disbanding due not being able to do the level 60 content (Dead end for those people in the game).And promised only to add 5-man, 10-man, and 25-man instances once the add-on comes out,no more 40-man dungeons (yay!), and the 10-man instance gear will be equal with MC/BWL loot quality.
Since Magorian took Knights of Mercia over and wants to try to move the guild forward to be able to do 20-man instances I think he'll also be able to prepare the guild for the new 10 and 25-man content when the add on hits,since he still has a few months to do that,he'll need all of us to be available and be willing to help,it might be difficult at the beginning but once KoM starts being successful in raiding the guild will gain a good reputation and people will be willing to join us which will make it easier to expand the guild.
-Xardus