Here's another question, how do you adjust the XP, if you buy it down from the Unearthed Arcana (p 18)?
If (assuming I have 6,000 xp, need 10,000 xp to get to 4th level) I gain 3,000 xp, giving me 9,000, can I then buy down the level adjustment (because it costs 3,000 xp: the current (ECL -1)...