[TWheels]

A possibly dissenting opinion: @lijong, the best router for you is the one with which you are most comfortable and allows you to do what you want to do. In general, get the most powerful router that takes both 1/4 an 1/2 inch shaft bits (or 6 mm and 12 mm shaft bits?). Above table height adjustment is a very serious time saver. As fo the fixed base + plunge base, a plunge base can do anything a fixed base can do, but not all plunge routers have above table height adjustment.
Another issue is customer support. Bosch and Makita are both first rate, based on my experience.

 

[TWheels]

Visit a retailer that has routers on display so you can grab them by the handle and see how they feel; you need to be comfortable holding the router handles. I do not like the round handles on the Bosch routers so I have never bought one; I may be missing a router that is perfect in other regards but it first needs to feel comfortable. Next, consider dust collection. Can you easily connect the router to some kind of dust collector? I make a lot of mortises with a plunge router and I used a PC891 (120V, 12A); dust collection is not very good when you use guide bushings. An improvement in the dust collection department is the DW621 (120V, 10A). Another feature is convenience of the on/off switch. The DW621 has the on/off switch on one of the handles while the PC891 requires moving your hand from the handle to the top of the router motor. While my PC891 is more powerful, I prefer using the DW621. Are you in an area that has a local woodworking club? This can be a great resource. Good luck on your selection.

@bfblack, IMHO you are spot on. I had tried to say essentially the same thing.

I agree with your comment about the Bosch routers. I still do not understand why Bosch also sells the MRC23ESSK which has an immeasurably small (in the real world) more power than the 1617 to which you refer. I chose the MRC23 because the handles seem much better for me.