MaximRecoil said:

Well, I think your confusing the philisophical 'size matters not' Yoda says with a quantifiable statement of power.

What is "philosophical" about it? Yoda's claim that the size doesn't matter was a direct reply to Luke's suggestion that the size of the ship did matter. What if Luke then pointed to an object larger and heavier than the ship and asked him to lift it. Would Yoda have said that he couldn't because it was too big? That would have made him look rather foolish considering what he'd just said about the size not mattering.

There are clearly limits on what the Force can move (I'm only talking the movies here).

According to Yoda there are no limits. Additionally, there are no scenes that I know of where Yoda tries to move something and fails because the object is too big. Where are these "clear limits" established?

Given utter peace and quiet the greatest Jedi master (Yoda) managed to quite slowly pick up a spacefighter. That's the single most impressive example of the power in either trilogy.

There is nothing which establishes that peace and quiet are prerequisites, and there is nothing to establish that Yoda was moving the ship as fast as he could. There are various reasons that he could have been moving it slowly, e.g., for effect (letting the effect soak into Luke); not wanting to damage the craft; or simply because he wasn't in a hurry.

And that is not necessarily the most impressive display of the power in either trilogy. Dooku broke some structures from the building in AOTC, and I would guess that their load bearing capacity exceeded the weight of an X-Wing fighter.

There's no reason to beleive he could 'crush' the Death Star

He claimed that size doesn't matter in reply to Luke's suggestion that the ship was too big to move. He did not say that size doesn't matter, as long as it is no bigger than an X-Wing fighter.

Let's look at two possible scenarios.

1- Size does indeed not matter in any quantifiable sense to Jedi, and they have nigh unlimited power capable of easily slinging the Death Star around. All through the Star Wars saga Jedi refuse to use these powers because apparently, they are stupid.

2- Yoda's 'size matters not' comment carries with it a grain of truth, but not as a definite measurement of Jedi telekinises, but as some kind of statement about the relationships of things to the Force. Jedi telekinises should not be limited by self-induced weaknesses based on object's sizes, but otherwise does have clear physical limitations at some level, which explains why they do not in fact, hurl Death Stars around and crush planets.

I tend towards #2