good lens to upgrade to? 28-135...also upgrade form xsi to mark II

this one: http://www.amazon.com/canon-28-135m...1?s=electronics&ie=utf8&qid=1332903703&sr=1-1

have these 3 already.
1. http://www.amazon.com/gp/product/b00007e7ju/ref=oh_o04_s00_i00_details
2. http://www.amazon.com/gp/product/b000v5k3fg/ref=oh_o06_s00_i00_details (stock, replace one?)
3. http://www.amazon.com/canon-75-300m...1?s=electronics&ie=utf8&qid=1332904241&sr=1-1

idea of having lens can use things , don't have change between zoom , regular. given current lens portfolio, buy or unnecessary?

_________________________________________________
, upgrade xsi mark ii??? id ability take pictures in lower light....iso 25600?!?!?! noisy s*** or what?

http://www.amazon.com/canon-21-1mp-...ztls/ref=sr_1_1?ie=utf8&qid=1332905188&sr=8-1

 

tokina or sigma

imho, deal on used tokina 50-135 f/2.8, wicked lens. or @ sigma 50-150 os f/2.8, choice. cruise following forum, have purchased glass here @ grab savings buying new.


toikna reviews: http://www.fredmiranda.com/reviews/showproduct.php?product=328&sort=7&cat=40&page=2

sigma:http://www.fredmiranda.com/reviews/showproduct.php?product=331&sort=7&cat=37&page=3

luck , shooting

ourabmen

 

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