I doubt people are usually primed to go to SG, but maybe that's changed. Usually need guild for that. HS you could probably get non guildies to come, juggs I think usually guilds do that but you could probably find non guildies to do that too. Broodmother I don't think is too much of a problem gathering folks?
Most people you end up grouping with 55+ probably have a range of characters they can play. If you're talking about high level dungeons then ENC/BARD would probably be fun. If you're talking "raiding" at the highest level ENC is pretty redundant for a lot of fights. Clerics are always wanted but are boring IMO, at least if they're played the way groups expect you to play them.
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