RE: Short axle bows.
notavegiatrian: PERFECT answer for the short ATA question.
As for sights, I have the Copper John's sight, and just got a Trophy Ridge Nitro Extreme. The ONLY reason I decided to switch to the Nitro, is that the pin light I was using for my pins seemed to be going through bulbs (LEDs technically). Maybe due to vibration...maybe something else, but I wanted something a bit more reliable...the Nitro lights seem to be the answer. The Trophy Ridge also is a bit brighter without the lights as well.
BOTH are GREAT sights, but I wanted reliability.
BTW...I suggest the Nitro extreme over the Matrix...basically they are the same sight...only the Matrix has the DVD thingies. If you REALLY think those things do diddly squat...get the Matrix...I have tried and failed to get the Nitro to make any etxra noise that the DVD would stop (ringing by hitting with a wrench....NONE!)