As you're planning, keep in mind minimums are just that, the least your guild will tolerate.
Communicate with the frustrated members, some may never be happy until they are hitting 300k+, 300t, 1500 seals, and your more casual members will never reach that.
With Guild Wars coming out next week, you really have an option to have much different requirements than what we've had before. Something like 100k gold, plus play all your guild war matches, plus 500 seals. This can free up those that don't like PvP while still helping the guild advance.