Which router should you buy?
That's one of the questions we're most often asked.  Since we don't sell routers, we can give you an unbiased opinion.  Power is one consideration, but that's hard to compare as there's no uniform HP test procedure used by manufacturers.  Best bet is to compare the amp rating.  The location, size and type of handles, on/off switch and depth control are important, but individual, considerations.  For example, I'm comfortable with a two handled router where some people prefer a D-handled model.  And I really like the body grip on the Milwaukee routers, but some people may find them awkward.  Best bet is to actually hold the router in your hands and feel how it will work for you.
I think the collet is the single most important component and it influences my router selections the most.  Long collets with multiple slits are the best choice.  Compare a router bit to a fence post.  The further you put the fence post in the ground, and the better the hole conforms to the post, the better it holds.  With a router bit this means less vibration, run-out and noise, producing better cuts and longer bit life.

Brad's Router Picks:
Fixed Base Routers (removable motors):
We've shop tested:  Bosch 1617/18, Hitachi M12VC, Makita RF1101, Milwaukee 5615 & 5625, Porter Cable 690, 892 & 7518 and DeWalt 616.
My favorite for medium duty hand or table use:  Bosch 1617/18. 
My favorite for heavy duty table use:  Milwaukee 5625

Plunge Routers:
We've shop tested:  Bosch 1613 & 1619, Freud FT2000E, Ryobi RE600, DeWalt 621 & 625, Fein RT1800, Hitachi M12V & TR12, Makita 3612C, Porter Cable 7529 & 7539 and Triton 2-1/4 HP & 3 HP.
My favorite for hand or table use:  DeWalt 625
(wish the collet projected further past the base) and the Triton 2-1/4 HP.