replacement Stem

I'm suffering with pins and needles in my hands when I ride my Spesh Tricross Sport for over an hour.
Thought it might be from reaching out too far so I am thinking about replacing the stem with a shorter one (about 20-25mm shorter).
There seems to be a massive difference in price, depending on brand. Is there anything in particular that I should look for, or are all stems pretty much the same for a given length/angle?
Thought it might be from reaching out too far so I am thinking about replacing the stem with a shorter one (about 20-25mm shorter).
There seems to be a massive difference in price, depending on brand. Is there anything in particular that I should look for, or are all stems pretty much the same for a given length/angle?
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Watch out for the stack height as they aren't all the same.