There are two problems with the 135mm and extenders, you lose AF speed and image quality significantly with the extenders on the 135mm. You cut the AF by half with the 1.4x and twice with the 2x, most likely slower than any of the 70-200's. The IQ with extenders and 135mm noticebly worst with the 1.4x than the 70-200's and significantly worst with the 2x. Another thing is you aren't saving but a few ounces by going that route and would cost more than a 70-200mm f/2.8 IS and nearly as much as the II version. I would concur with HD and strongly recomend the 70-200mm f/2.8 IS (II if possible) over the 135mm and extenders. If you are really bent on primes the 24mm f/1.4, 35mm f/1.4 and 50mm f/1.4 (for cost reasons) in combination with the 70-200mm is a excelent combination.
Later on add the 135mm f/2.0 and 14mm f/2.8 and you got a killer combo!
John.
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