Red plat, etc.

[Tanthallas]

WTT Blue plat/items for Red plat/items.

WTB Jboots MQ with blue plat.

WTT Blue accounts for comparable Red accounts.

[Captivate]

What do you mean about comparable?

IMO a 55 ench on red with average gear is worth a level 60, well geared + epic ench on blue.

Same would go for any other class.