So we're not really making fighters as powerful as casters. We're turning the non-casters into casters
This is a fundamental misunderstanding of Tome of Battle. There are several differences between the Tome of Battle classes and casters:
1) Maneuvers and stances are not expended in the same way as daily uses of abilities, thus, fighting classes keep one of their primary strong points - they do not run out of juice.
2) Maneuvers extremely rarely have area effects or manipulate the battlefield in the way spells do.
3) Maneuvers and stances only affect battles except in extremely rare cases (they do not give you access to teleporting, becoming invissible for prolonged amounts of time or similar).
4) Maneuvers and stances all require the user to be in melee to function.
Thus, Tome of Battle does not make fighters into casters at all. In point of fact, it is a geniously designed volume.
they're basically spells.
Spells that are weaker, affect only combat, have no verbal or somatic components, require attacking, can be refreshed with everything from a standard action to five minutes of rest (as opposed to a full nights sleep) and only in extremely rare cases have effects that even look like spells.
Concerning the Monk, I'm not keen on Pounce. That sounds overpowered to me.
To make the Monk really unique, how about giving him a Ki Strike that increases at every level? By level 20 he would then bypass 20 points of DR.
The Stunning Fist percentage can be removed and we can make Stunning Fist work like in the SRD (an ability useable once per day for every four levels, like a Paladin's Smite Evil).
Sounds good.