Warblade class description states:
Originally Posted by Maneuvers, p21 ToB
You begin your career with knowledge of three martial maneuvers...
You must meet a maneuver’s prerequisite to learn it. See Table 3–1, page 39, to determine the highest-level maneuvers you can learn.
Check your initiator level on the table (level 6) and you can learn any maneuver within your disciplines of up to level 3, assuming you meet the pre-requisites. You can take a maneuver, and then immediately use that maneuver to qualify for a different one, as you get to apply them in the order most advantageous to you.
warbladed. But I'll answer your question, Andezzar.
You are correct in the first method, but the second method costs 23,000 gp (total).
First method uses Table 6-11, page 234 MiC. Applying a +1 Deflection bonus to Ring of Invis costs 2000 gp. The second method, applying invisibility to a ring of protection, costs 21,000 gp additional. See page 233 MiC. If the added ability costs more than the cost of the item, you add the base cost + 1/2 the cost of the item to be enhanced. So you'll spend an extra 1000 gp doing it the second way.